Circles Practice

Front

What is the radius of a circle?

Back

The radius is the distance from the center of the circle to any point on its circumference.

Front

What is the diameter of a circle?

Back

The diameter is the distance across the circle through its center, equal to twice the radius.

Front

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

Back

The diameter is 20 ft.

Front

What is the relationship between the radius and diameter?

Back

The radius is half of the diameter.

Front

What is the formula for the circumference of a circle?

Back

Circumference = 2 × π × radius.

Front

If the radius of a circle is 5 ft, what is the circumference?

Back

Circumference = 2 × π × 5 ft ≈ 31.4 ft.

Front

What is the area of a circle?

Back

Area = π × radius².

Front

If the radius of a circle is 4 ft, what is the area?

Back

Area = π × 4² = 16π ft² ≈ 50.3 ft².

Front

What is the term for the distance around a circle?

Back

The term is circumference.

Front

What is the term for the space contained within a circle?

Back

The term is area.