Radius, Diameter, and Circumference

Front

What is the line from the center point to the edge of the circle called?

Back

Radius

Front

What is the blue colored part of this circle called?

Back

Circumference

Front

What does 'circumference' mean?

Back

Distance around a circle

Front

What is the diameter of a circle?

Back

A line that passes through the center of the circle and touches both sides.

Front

If the radius of a circle is 8 cm, what is the diameter?

Back

16 cm

Front

If the diameter of a circle is 10 in, what is the radius?

Back

5 in

Front

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

Back

C = πd or C = 2πr

Front

What is the value of π (pi) approximately?

Back

3.14

Front

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

Back

10 cm

Front

If the radius of a circle is doubled, what happens to the circumference?

Back

It also doubles.