Circumference of a Circle: Practice

Front

What is the formula to calculate the circumference of a circle?

Back

C = 2πr, where C is the circumference and r is the radius.

Tags

CCSS.7.G.B.4

Front

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

Back

C = 2π(10) = 62.83 cm.

Tags

CCSS.7.G.B.4

Front

What is the value of π (pi) approximately?

Back

π is approximately 3.14.

Tags

CCSS.HSG.GMD.A.1

Front

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

Back

r = C / (2π).

Tags

CCSS.7.G.B.4

Front

What is the circumference of a circle with a diameter of 8 cm?

Back

C = πd = π(8) = 25.12 cm.

Tags

CCSS.7.G.B.4

Front

If a circle has a circumference of 31.4 cm, what is its radius?

Back

r = C / (2π) = 31.4 / (2π) ≈ 5 cm.

Tags

CCSS.7.G.B.4

Front

What is the relationship between diameter and radius?

Back

The diameter is twice the radius (d = 2r).

Tags

CCSS.7.G.B.4

Front

If the circumference of a circle is 50.24 cm, what is the diameter?

Back

d = C / π = 50.24 / π ≈ 16 cm.

Tags

CCSS.7.G.B.4

Front

What is the circumference of a circle with a radius of 3 cm?

Back

C = 2π(3) = 18.84 cm.

Tags

CCSS.7.G.B.4

Front

How does increasing the radius affect the circumference?

Back

Increasing the radius increases the circumference proportionally.

Tags

CCSS.7.G.B.4