Circle and Sphere

Definition of Terms

100

It is the length that makes a circle.

Circumference

200

A part of a surface of a something.

Area

300

A path that goes around a central point.

Circle

400

A three-dimensional shape that looks like a ball.

Sphere

500

A straight line from the center of a circle or sphere to any point on the circle or sphere.

radius

Finding the area

100

What is the area of a circle given three centimeter as the radius?

28.26cm²

200

What is the area of a sphere with 2 centimeters as the diameter?

12.56 cm²

300

What is the area of a circle with 4 meters as the diameter?

12.56m²

400

What is the area of a sphere with 5cm. as the radius?314

314cm²

500

What is the area of a circle with 8m. as the diameter?

50.24m²

Finding the radius

100

The diameter of a circle is 144cm. What is its radius?

72cm.

200

What is the radius of the circle given 16pi ft² as its area? 

Radius = 4ft.