Circumference Area Terms of Pi

The length around the outside of a circle is its _____.

• circumference

• radius

• diameter

• area

The radius of a circle is 4 inches. How would you calculate the circumference?

The diameter of a circle is 16 centimeters. How would you calculate the area?

• 2 in.

• 4 in.

• 8 in.

• 16 in.

• 6 cm.

• 12 cm.

• 18 cm.

• 9 cm.

• 3

• 36

• 9

• 12