Parts of a Circle

Front

The distance all the way around the circle is called the...

Back

Circumference

Front

The space contained inside of a circle is called the...

Back

Area

Front

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

Back

The diameter is 20 ft.

Front

The distance across the circle through the center is called the...

Back

Diameter

Front

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

Back

The radius is 5 ft.

Front

What is the formula for the circumference of a circle?

Back

Circumference = 2 × π × radius

Front

What is the formula for the area of a circle?

Back

Area = π × radius²

Front

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

Back

The area becomes four times larger.

Front

What is the relationship between diameter and radius?

Back

Diameter = 2 × radius

Front

What is π (pi) approximately equal to?

Back

π is approximately equal to 3.14.