Geometry Essentials: Vocabulary and Concepts Quiz

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| Questions: 29 | Updated: Nov 4, 2025

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1) What is an acute angle?

An angle with a degree measure greater than 90 degrees.

An angle with a degree measure less than 180 degrees.

An angle with a degree measure of exactly 90 degrees.

An angle with a degree measure less than 90

An acute angle is defined as an angle with a degree measure less than 90 degrees, making all other options incorrect.

Explanation

An acute angle is defined as an angle with a degree measure less than 90 degrees, making all other options incorrect.

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About This Quiz

Enhance your understanding of geometry with this focused vocabulary quiz. It is designed to test key terms and concepts essential in the field of geometry, making it ideal for students looking to improve their mathematical vocabulary and comprehension.

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2) What is distance?

The weight of an object being transported between two points.

The speed at which you travel between two points.

The time it takes to travel between two points.

The amount of space between two points.

Distance refers to the physical space between two points, not the time, speed, or weight associated with the travel between them.

Explanation

Distance refers to the physical space between two points, not the time, speed, or weight associated with the travel between them.

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3) What are perpendicular lines?

Lines that intersect at any angle other than 90 degrees.

Lines that are parallel.

Lines that are curved.

Lines that form right angles

Perpendicular lines are two lines that intersect at a 90-degree angle, forming right angles.

Explanation

Perpendicular lines are two lines that intersect at a 90-degree angle, forming right angles.

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4) What is an acute triangle?

A triangle with all angles measuring less than 45 degrees.

A triangle with at least one angle measuring 180 degrees.

A triangle in which all the angles are acute angles.

A triangle with one angle greater than 90 degrees.

An acute triangle is a type of triangle where all three angles are less than 90 degrees, making them acute angles.

Explanation

An acute triangle is a type of triangle where all three angles are less than 90 degrees, making them acute angles.

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5) What is the definition of 'exterior' in terms of an angle?

A point is in the exterior of an angle if it is neither on the angle nor in the interior... A point is in the exterior of an angle if it is neither on the angle nor in the interior of the angle.

A point is in the exterior of an angle if it lies on the angle itself.

A point is in the exterior of an angle if it is in the interior of the angle.

A point is in the exterior of an angle if it is equidistant from both arms of the angle.

The correct definition of 'exterior' in terms of an angle is when a point is neither on the angle nor in the interior of the angle, placing it outside the angle.

Explanation

The correct definition of 'exterior' in terms of an angle is when a point is neither on the angle nor in the interior of the angle, placing it outside the angle.

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6) What is a plane in the context of geometry?

A basic undefined term of geometry. a flat surface made up of points that has no depth and extends indefinitely... A basic undefined term of geometry. a flat surface made up of points that has no depth and extends indefinitely in all directions.

A curved surface with depth and limited extent.

A three-dimensional shape with width, height, and depth.

An object flying in the sky.

In geometry, a plane refers to a flat surface without depth or boundaries.

Explanation

In geometry, a plane refers to a flat surface without depth or boundaries.

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7) What are adjacent angles?

Two angles that are on opposite sides of a line

Two angles that add up to 90 degrees

Two angles that lie in the same plane, have a common vertex and a common side, but no common interior... Two angles that lie in the same plane, have a common vertex and a common side, but no common interior points.

Two angles that are parallel to each other

Adjacent angles are angles that share a common vertex and side, but do not overlap in any way. They are typically next to each other and do not necessarily add up to any specific measurement.

Explanation

Adjacent angles are angles that share a common vertex and side, but do not overlap in any way. They are typically next to each other and do not necessarily add up to any specific measurement.

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8) What is a point?

A line segment

A fully defined mathematical object

A two-dimensional shape

A basic undefined term. a point is a locations. they are represented by a dot and are named by capital... A basic undefined term. a point is a locations. they are represented by a dot and are named by capital letters.

A point is a fundamental concept in geometry, denoting a specific location in space without any dimensions.

Explanation

A point is a fundamental concept in geometry, denoting a specific location in space without any dimensions.

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9) What is an angle?

A shape formed by two parallel lines.

An acute angle that measures less than 90 degrees.

A right angle that measures exactly 90 degrees.

The intersection of two noncollinear ray at a common endpoint.

The distance between two points on a circle.

An angle is formed by two rays meeting at a common endpoint, not by shapes or specific measurements like distances or degrees.

Explanation

An angle is formed by two rays meeting at a common endpoint, not by shapes or specific measurements like distances or degrees.

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10) What is a line?

A three-dimensional object with length, width, and height.

A basic undefined term. it is made up of points and has no thickness of width.

A colorful mark on a surface.

A closed two-dimensional shape.

In geometry, a line is a one-dimensional figure that extends infinitely in both directions. It has no endpoints and is considered one of the basic building blocks in the study of shapes and figures.

Explanation

In geometry, a line is a one-dimensional figure that extends infinitely in both directions. It has no endpoints and is considered one of the basic building blocks in the study of shapes and figures.

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11) What is a postulate in geometry?

A statement that describes a fundamental relationship between the basic terms of geometry. they are accepted as true without proof.example:... A statement that describes a fundamental relationship between the basic terms of geometry. they are accepted as true without proof.example: through any two points there is exactly one line.

A theorem that has been proven to be true.

An educated guess based on limited information.

A type of polygon with four sides and four angles.

A postulate in geometry is a statement that is assumed to be true without requiring proof. It serves as a basic starting point for building geometric arguments and proofs.

Explanation

A postulate in geometry is a statement that is assumed to be true without requiring proof. It serves as a basic starting point for building geometric arguments and proofs.

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12) What is an angle bisector?

A line segment that connects two nonadjacent vertices of a polygon.

A line that intersects two angles at their vertex.

A ray that divides an angle into two supplementary angles.

A ray that divided an angle into two congruent angles.

An angle bisector is a ray that divides an angle into two equal parts, creating two congruent angles.

Explanation

An angle bisector is a ray that divides an angle into two equal parts, creating two congruent angles.

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13) What is a line segment?

A line segment is a fixed length of a line that cannot be measured.

A measurable paret of a line that consists of two points, called endpoints, and all of the points between them.

A line segment is the longest distance between two points on a line.

A line segment is a curved section of a line that connects two points.

A line segment is defined by its two distinct endpoints and all the points along the line connecting those two endpoints. It is a straight path between two points.

Explanation

A line segment is defined by its two distinct endpoints and all the points along the line connecting those two endpoints. It is a straight path between two points.

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14) What is the definition of collinear?

Points that create a right angle

Points that form a perfect square

Points that are equidistant from each other

Points that lie on the same line

Collinear points are points that can be connected by a single straight line.

Explanation

Collinear points are points that can be connected by a single straight line.

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15) What is a linear pair?

Two angles that are equal in measure.

Two angles that share a side but have no common vertex.

A pair of adjacent angles whose non common sides are opposite rays.

A pair of angles that add up to 180 degrees.

A linear pair specifically refers to two angles that are adjacent and form a straight line when combined.

Explanation

A linear pair specifically refers to two angles that are adjacent and form a straight line when combined.

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16) What is a right angle?

An angle with a measure of 90 degrees

An angle with a measure of 180 degrees

An angle with a measure of 45 degrees

An angle with a measure of 270 degrees

A right angle is specifically defined as having a measure of 90 degrees, not 180, 45, or 270 degrees.

Explanation

A right angle is specifically defined as having a measure of 90 degrees, not 180, 45, or 270 degrees.

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17) What are complementary angles?

Two angles with measures that have a sum of 180.

Two angles with measures that have a sum of 120.

Two angles with measures that have a sum of 90

Two angles with measures that have a sum of 45.

Complementary angles have measures that add up to 90 degrees, not 180, 45, or 120 degrees.

Explanation

Complementary angles have measures that add up to 90 degrees, not 180, 45, or 120 degrees.

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18) What is the definition of a midpoint?

The intersection point of two segments.

The point closest to the origin on a graph.

The point halfway between the endpoints of a segment.

The starting point of a segment.

A midpoint is specifically defined as the point that lies exactly halfway between the endpoints of a segment, dividing the segment into two equal parts.

Explanation

A midpoint is specifically defined as the point that lies exactly halfway between the endpoints of a segment, dividing the segment into two equal parts.

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19) What is a segment bisector?

A segment, line or plane, that intersects a segment at its midpoint.

A line that divides a segment into two equal parts.

A point that lies on a segment.

A segment that connects two endpoints.

A segment bisector is specifically defined as a segment, line, or plane that intersects a segment at its midpoint, not just a line that divides a segment into two equal parts, a point that lies on a segment, or a segment that connects two endpoints.

Explanation

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20) What does 'congruent' mean?

Having different measurements

Similar in shape but different in size

Having opposite measures

Having the same measure

Congruent refers to figures or objects that have the same measure or dimensions. It means they are identical in size and shape.

Explanation

Congruent refers to figures or objects that have the same measure or dimensions. It means they are identical in size and shape.

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21) What is an obtuse angle?

An angle with a degree measure exactly equal to 90.

An angle with a degree measure greater than or equal to 180.

An angle with a degree measure less than 90.

An angle with a degree measure greater than 90 but less than 180

An obtuse angle is specifically defined as having a degree measure greater than 90 but less than 180, distinguishing it from acute angles (less than 90 degrees) and right angles (exactly 90 degrees) as well as reflex angles (greater than 180 degrees).

Explanation

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22) What is space?

The set of all points

A void without any matter.

The area above the earth's atmosphere.

A place where astronauts go to conduct research.

Space is defined as the set of all points and is not limited to just the area above the earth's atmosphere or a void without any matter. It is not just a place for astronauts to conduct research, but encompasses everything in the universe.

Explanation

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23) What does the term 'coplanar' refer to in geometry?

Points that are three-dimensional

Points that do not lie in the same plane

Points that form a straight line

Points that lie in the same plane

In geometry, coplanar points are points that lie within the same two-dimensional plane.

Explanation

In geometry, coplanar points are points that lie within the same two-dimensional plane.

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24) What are opposite rays?

Rays that have the same length.

Rays that intersect at a point.

Rays that go in different directions

Rays that go in the same direction.

Opposite rays are two rays that have the same starting point and go in exactly opposite directions.

Explanation

Opposite rays are two rays that have the same starting point and go in exactly opposite directions.

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25) What are supplementary angles?

Two perpendicular angles.

Two vertical angles.

Two angles with measures that have a sum of 90.

Two angles with measures that have a sum of 180

Supplementary angles are a pair of angles whose measures add up to 180 degrees. This concept is important in geometry and can help solve various problems involving angle measurements.

Explanation

Supplementary angles are a pair of angles whose measures add up to 180 degrees. This concept is important in geometry and can help solve various problems involving angle measurements.

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26) What is a degree?

A unit of measure used in measuring angles and arcs

The level of comparison or intensity of something.

A category or rank within a hierarchical structure.

A type of certification or qualification.

A degree is a specific unit used in geometry and trigonometry to quantify angles and rotations.

Explanation

A degree is a specific unit used in geometry and trigonometry to quantify angles and rotations.

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27) What is a perpendicular bisector?

A line that divides a figure into two congruent parts.

A line that lies in the same plane but never intersects with another line.

In a triangle, a line, segment, or ray that passes through the midpoint of a side and is perpendicular to... In a triangle, a line, segment, or ray that passes through the midpoint of a side and is perpendicular to that side.

A line that connects two nonadjacent vertices of a polygon.

A perpendicular bisector specifically refers to a line, segment, or ray in a triangle that meets the criteria of passing through the midpoint of a side and being perpendicular to that side.

Explanation

A perpendicular bisector specifically refers to a line, segment, or ray in a triangle that meets the criteria of passing through the midpoint of a side and being perpendicular to that side.

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28) What does it mean for a point to be in the interior of an angle?

A point is in the interior of an angle if it lies outside the angle.

A point is in the interior of an angle if it does not lie on the angle itself and it... A point is in the interior of an angle if it does not lie on the angle itself and it lies on a segment with endpoints that are on the sides of the angle.

A point is in the interior of an angle if it lies directly on the angle.

A point is in the interior of an angle if it is located on one of the sides of the... A point is in the interior of an angle if it is located on one of the sides of the angle.

To be considered in the interior of an angle, a point must fulfill the specific criteria of not lying on the angle itself and lying on a segment with endpoints on the sides of the angle.

Explanation

To be considered in the interior of an angle, a point must fulfill the specific criteria of not lying on the angle itself and lying on a segment with endpoints on the sides of the angle.

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29) What are undefined terms in geometry?

Words, usually readily understood, that are not formally explained by means of more basic words and concepts.example: points, lines, and... Words, usually readily understood, that are not formally explained by means of more basic words and concepts.example: points, lines, and planes.

Concepts that are constantly changing and evolving with new research and discoveries.

Words that are difficult to comprehend and require extensive explanation.

Terms that have multiple definitions depending on the context.

Undefined terms in geometry are foundational concepts that are assumed to be understood without further explanation. They serve as building blocks for defining other geometric shapes and properties.

Explanation

Undefined terms in geometry are foundational concepts that are assumed to be understood without further explanation. They serve as building blocks for defining other geometric shapes and properties.

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