Circles: Area and Circumference

Front

Circumference

Back

The distance around a circle.

Front

What is the area of a circle?

Back

The space inside the circle.

Front

Is the red line a radius or diameter of the circle?

Back

Radius

Front

What is π ?

Back

The ratio of the circumference of any circle to its diameter.

Front

How do you find the radius?

Back

d/2

Front

If my diameter is 19 inches, what is my radius?

Back

9.5 inches

Front

The radius of a circle is

Back

The measurement from the center of a circle to an edge of the circle.

Front

If my radius is 10ft, what is my diameter?

Back

20ft

Front

A DVD has a diameter of 15 millimeters. Which equation would help you determine the circumference? Options: c = 15π, C = 2π15, c = 15 ÷ π, c = 15 π

Back

c = 15π

Front

What is the area of this circle? Options: 8322.13, 1134.11, 4536.46, 1267.09

Back

1134.11