Circles Review

Front

What is the formula for circumference of a circle given the diameter?

Back

C = π d

Front

What is the formula for the area of a circle?

Back

A = π r²

Front

What is the relationship between diameter and radius?

Back

Diameter = 2 × Radius

Front

How do you find the radius if you know the circumference?

Back

Radius = Circumference / (2 × π)

Front

What is the formula for circumference of a circle given the radius?

Back

C = 2 × π r

Front

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

Back

A = π (5)² = 78.5 ft²

Front

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

Back

Radius = 10 ft / 2 = 5 ft

Front

What is the circumference of a circle with a radius of 7 ft?

Back

C = 2 × π × 7 ≈ 43.98 ft

Front

What is the area of a circle with a diameter of 8 ft?

Back

A = π (4)² = 50.27 ft²

Front

If the circumference of a circle is 31.4 ft, what is the diameter?

Back

Diameter = Circumference / π = 10 ft