Circles

Circle Parts

100

This circle part is the longest chord.

What is the diameter?

200

This circle part can be calculated by dividing a diameter of the same circle by 2.

What is a radius?

300

This circle part touches the circle in exactly one place.

What is a tangent?

400

This circle part is like the perimeter of a circle, it goes all the way around.

What is the circumference?

500

This circle part is comprised of 2 radii and the arc between them. It resembles a slice of pizza.

What is a sector?

Area

100

Calculate the area of a circle with a radius of 3 in.

What is 28.26 sq in?

200

Calculate the area of a circle with a diameter of 12 in.

What is 113.04 sq in?

300

Calculate the area of a circle with a radius of 10 in.

What is 314 sq in?

400

Calculate the area of a circle with a diameter of 24 in.

What is 452.16 sq in?

500

Calculate the radius of a circle with an area of 200.96 sq in.

What is 8 in?

Circumference

100

Calculate the circumference of a circle with a radius of 4 in.

What is 25.12 in?

200

Calculate the circumference of a circle with a diameter of 26 in.

What is 81.64 in?

300

Calculate the circumference of a circle with a radius of 7.2 in.

What is 45.216 in?

400

Calculate the diameter of a circle with a diameter of 9.9 in.

What is 31.086 in?

500

Calculate the radius of a circle that has a circumference of 50.24 in.

What is 16 in?