Parts of Circles

Front

The radius is ____ the diameter.

Back

half

Front

What is the diameter of a circle with a radius of 4.25 inches?

Back

8.5 inches

Front

The fence around a circular pool is 75 feet. What part of a circle does this describe?

Back

circumference

Front

The tires on a monster truck are 6 feet tall. What part of a circle does this describe?

Back

diameter

Front

The length of the second hand on a clock is 5 inches. What part of a circle does this describe?

Back

radius

Front

What is the formula for the circumference of a circle?

Back

C = 2πr or C = πd

Front

What is the formula for the area of a circle?

Back

A = πr²

Front

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

Back

5 inches

Front

What is the relationship between radius and diameter?

Back

Diameter is twice the radius.

Front

What part of a circle is the distance around it?

Back

Circumference