Circles: Area and Circumference

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

If the radius of a circle is 6 cm, what is its area?

Back

Area = π × (6)² = 113.1 cm² (approximately).

Front

If the radius of a circle is 10 cm, what is its circumference?

Back

Circumference = 2 × π × 10 = 62.8 cm (approximately).

Front

What is the value of π (pi)?

Back

π (pi) is approximately 3.14.

Front

How do you find the diameter of a circle?

Back

Diameter = 2 × radius.

Front

If a circle has a diameter of 24 cm, what is its radius?

Back

Radius = Diameter / 2 = 12 cm.

Front

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

Back

Area = π × (5)² = 78.5 cm² (approximately).

Front

What is the circumference of a circle with a radius of 4 cm?

Back

Circumference = 2 × π × 4 = 25.12 cm (approximately).