Circles: Area and Circumference Formative/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 formula for the area of a circle?

Back

Area = π * r², where r is the radius.

Front

What is the formula for the circumference of a circle?

Back

Circumference = 2 * π * r, where r is the radius.

Front

How do you find the diameter of a circle?

Back

Diameter = 2 * r, where r is the radius.

Front

What is the relationship between diameter and radius?

Back

The diameter is twice the length of the radius.

Front

If the radius is 3, what is the area of the circle?

Back

Area = π * 3² = 28.27 (approximately).

Front

If the radius is 8 inches, what is the circumference?

Back

Circumference = 2 * π * 8 = 50.24 inches (approximately).

Front

What is the diameter of a circle with a radius of 5 cm?

Back

Diameter = 2 * 5 = 10 cm.

Front

If a circle has a diameter of 10 cm, what is its radius?

Back

Radius = 10 / 2 = 5 cm.

Front

What is the area of a circle with a diameter of 4 cm?

Back

Area = π * (2)² = 12.57 cm² (approximately).