Geometry Cards

1. What is a diameter?

The area enclosed by a circle.

The radius of a circle.

A straight line across the center of a circle

The distance around the outside of a circle.

The diameter is a straight line that passes through the center of a circle, connecting two points on the circumference.

Explanation

The diameter is a straight line that passes through the center of a circle, connecting two points on the circumference.

2. What is the circumference of a circle?

The area inside a circle

The diameter of a circle

The distance around a circle (outside)

The distance across a circle

The circumference of a circle refers to the distance around the outside of the circle, which is different from the diameter (distance across) and the area inside the circle.

Explanation

The circumference of a circle refers to the distance around the outside of the circle, which is different from the diameter (distance across) and the area inside the circle.

3. What is an acute angle?

An angle greater than 90 degrees.

An angle exactly 90 degrees.

An angle less than 180 degrees.

An angle less than 90 degrees

An acute angle is defined as an angle that is less than 90 degrees. Any angle that is exactly 90 degrees is referred to as a right angle, while angles greater than 90 degrees are called obtuse angles. Angles less than 180 degrees but greater than 90 degrees are considered obtuse angles.

Explanation

An acute angle is defined as an angle that is less than 90 degrees. Any angle that is exactly 90 degrees is referred to as a right angle, while angles greater than 90 degrees are called obtuse angles. Angles less than 180 degrees but greater than 90 degrees are considered obtuse angles.

4. What is an obtuse angle?

An angle exactly 180 degrees

An angle exactly 90 degrees

An angle more than 90 degrees, less than 180 degrees

An angle less than 90 degrees

An obtuse angle is any angle that is greater than 90 degrees but less than 180 degrees. It is not less than 90 degrees, exactly 90 degrees, or exactly 180 degrees.

Explanation

An obtuse angle is any angle that is greater than 90 degrees but less than 180 degrees. It is not less than 90 degrees, exactly 90 degrees, or exactly 180 degrees.

5. What is a straight angle?

An angle that is 180 degrees (straight line)

An angle that is 45 degrees.

An angle that is 360 degrees (full rotation).

An angle that is 90 degrees (right angle).

A straight angle measures 180 degrees, forming a straight line. It is different from a right angle (90 degrees), other acute or obtuse angles, and a full rotation angle of 360 degrees.

Explanation

A straight angle measures 180 degrees, forming a straight line. It is different from a right angle (90 degrees), other acute or obtuse angles, and a full rotation angle of 360 degrees.

6. What is a right angle?

An obtuse angle, it is greater than 90 degrees.

An acute angle, it is less than 90 degrees.

A reflex angle, it is greater than 180 degrees.

A Square angle, it is exactly 90 degrees

A right angle is a 90 degree angle, forming a perfect square corner. An obtuse angle is greater than 90 degrees, an acute angle is less than 90 degrees, and a reflex angle is greater than 180 degrees.

Explanation

A right angle is a 90 degree angle, forming a perfect square corner. An obtuse angle is greater than 90 degrees, an acute angle is less than 90 degrees, and a reflex angle is greater than 180 degrees.

7. What fraction of a circle does 270 degrees represent?

1/2 of a circle

2/3 of a circle

3/4 of a circle