Circumference of Circles

Front

What is the diameter of a circle?

Back

A line through the center of a circle.

Front

What number represents π?

Back

3.14

Front

What is the formula for finding the circumference of a circle?

Back

C = π·d

Front

What is the circumference of a circle with a radius of 33 ft?

Back

207.2 ft

Front

Find the circumference of the circle with a diameter of 12 cm.

Back

37.7 cm

Front

What is the radius of a circle?

Back

Half the diameter of a circle.

Front

What is the relationship between diameter and radius?

Back

Diameter is twice the radius.

Front

How do you calculate the circumference using the radius?

Back

C = 2·π·r.

Front

What is the approximate value of π?

Back

3.14.

Front

If the circumference of a circle is 31.4 cm, what is its diameter?

Back

10 cm.