Circle Measurements and Properties

Front

What is the radius of a circle?

Back

The radius is the distance from the center of the circle to any point on its circumference.

Front

What is the diameter of a circle?

Back

The diameter is the distance across the circle through its center, equal to 2 times the radius.

Front

How do you calculate the diameter from the radius?

Back

Multiply the radius by 2 (d = 2 × r).

Front

What is the circumference of a circle?

Back

The circumference is the distance around the circle.

Front

How do you calculate the circumference of a circle?

Back

Use the formula C = 2πr, where r is the radius.

Front

What is the relationship between radius and diameter?

Back

The diameter is always twice the length of the radius.

Front

What is a chord in a circle?

Back

A chord is a line segment with both endpoints on the circle.

Front

What is the center of a circle?

Back

The center is the point that is equidistant from all points on the circumference.

Front

What is the area of a circle?

Back

The area is the space contained within the circle, calculated using the formula A = πr².

Front

What is the formula for the area of a circle?

Back

A = πr², where r is the radius.