Area & Circumference

Front

What is the circumference of a circle?

Back

The circumference is the distance around the circle, calculated using the formula C = 2πr or C = πd.

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 circumference of a circle?

Back

C = 2πr or C = πd.

Front

What is the formula for the area of a circle?

Back

A = πr².

Front

What is a 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 a diameter of a circle?

Back

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

Front

If the radius of a circle is 9 cm, what is the diameter?

Back

The diameter is 18 cm (D = 2r).

Front

If the diameter of a circle is 36 cm, what is the radius?

Back

The radius is 18 cm (r = D/2).

Front

What is the circumference of a circle with a radius of 9 cm?

Back

The circumference is 56.52 cm (C = 2πr).

Front

What is the area of a circle with a radius of 9 cm?

Back

The area is 254.47 cm² (A = πr²).