Angle Flash Cards

1. What is an acute angle?

Measures less than 90 degrees

Measures exactly 90 degrees

Measures more than 90 degrees

Measures greater than 180 degrees

An acute angle is defined as an angle that measures less than 90 degrees. It is smaller than a right angle (90 degrees) and obtuse angles (greater than 90 degrees).

Explanation

An acute angle is defined as an angle that measures less than 90 degrees. It is smaller than a right angle (90 degrees) and obtuse angles (greater than 90 degrees).

2. What defines a right angle?

Measures less than 90 degrees.

Measures exactly 90 degrees

Measures more than 90 degrees.

Is a full 180 degree angle.

A right angle is always exactly 90 degrees, forming a perfect L shape.

Explanation

A right angle is always exactly 90 degrees, forming a perfect L shape.

3. What is an obtuse angle?

Measures more than 90 degrees

Measures less than 90 degrees.

Refers to a straight angle of 180 degrees.

Measures exactly 90 degrees.

An obtuse angle is any angle that measures more than 90 degrees but less than 180 degrees.

Explanation

An obtuse angle is any angle that measures more than 90 degrees but less than 180 degrees.

4. What does a straight angle measure?

Measures exactly 180 degrees

Measures 90 degrees.

Measures 45 degrees.

Measures 360 degrees.

A straight angle is formed when two lines intersect and measure exactly 180 degrees, creating a straight line.

Explanation

A straight angle is formed when two lines intersect and measure exactly 180 degrees, creating a straight line.

5. What are complementary angles?

Two angles that are equal in measure.

Two angles that are adjacent to each other.

Two angles that add up to exactly 90 degrees

Two angles that add up to 180 degrees.

Complementary angles are a pair of angles that add up to exactly 90 degrees, forming a right angle when combined.

Explanation

Complementary angles are a pair of angles that add up to exactly 90 degrees, forming a right angle when combined.

6. How should angles be named?

Only name one ray without mentioning the vertex

Name one ray, then the vertex, then the other ray. The vertex must be in the middle of the name

Name the vertex first, then the two rays

Name both rays before the vertex

When naming angles, it is important to follow the specific order of naming one ray, then the vertex, and finally the other ray with the vertex in the middle. This convention ensures clarity and consistency in geometry notation.

Explanation

When naming angles, it is important to follow the specific order of naming one ray, then the vertex, and finally the other ray with the vertex in the middle. This convention ensures clarity and consistency in geometry notation.

7. What are supplementary angles?

Angles that are exactly 90 degrees.

Angles that are less than 90 degrees.

Angles that are greater than 180 degrees.

Two angles that add up to exactly 180 degrees

Supplementary angles are a pair of angles whose measures add up to 180 degrees. They do not necessarily have to be right angles (90 degrees) or smaller than 90 degrees.

Explanation

Supplementary angles are a pair of angles whose measures add up to 180 degrees. They do not necessarily have to be right angles (90 degrees) or smaller than 90 degrees.