Area and Circumference of a Circle

Front

What is the formula for the circumference of a circle?

Back

Circumference = 2 × π × radius

Front

What is the value of π (pi) approximately?

Back

π ≈ 3.14

Front

If the radius of a circle is 9 cm, what is the circumference?

Back

Circumference = 56.52 cm

Front

What is the formula for the area of a circle?

Back

Area = π × radius²

Front

If the diameter of a circle is 18 cm, what is the radius?

Back

Radius = 9 cm

Front

What is the area of a circle with a radius of 9 cm?

Back

Area = 254 cm²

Front

If Circle R has half the radius of Circle Q, and Circle Q has a radius of 12 cm, what is the radius of Circle R?

Back

Radius of Circle R = 6 cm

Front

What is the area of Circle R if its radius is 6 cm?

Back

Area = 113.04 cm²

Front

If the radius of a circular clock is 13 cm, what is the area?

Back

Area = 530.66 cm²

Front

What is the relationship between diameter and radius?

Back

Diameter = 2 × radius