Circumference

Front

What does d represent in the formula C = π·d?

Back

Diameter

Front

What is the diameter of a circle?

Back

The longest distance across the circle, passing through the center.

Front

What does 'circumference' mean?

Back

Distance around a circle.

Front

Does this picture show the diameter or radius of a circle?

Back

Diameter

Front

Determine the radius of a penny if the diameter is 19 mm.

Back

9.5 mm

Front

What is the formula to calculate the circumference of a circle?

Back

C = π·d or C = 2·π·r

Front

If the radius of a circle is 5 cm, what is the diameter?

Back

10 cm

Front

What is the value of π (pi) approximately?

Back

3.14

Front

How do you find the radius if you know the circumference?

Back

Use the formula r = C / (2·π).

Front

What is the relationship between diameter and radius?

Back

Diameter is twice the radius.