Circles Area and Circumference Review

Front

What is the formula for the circumference of a circle?

Back

C = πd or C = 2πr, where C is circumference, d is diameter, and r is radius.

Tags

CCSS.7.G.B.4

Front

What is the area of a circle?

Back

A = πr², where A is area and r is radius.

Tags

CCSS.7.G.B.4

Front

If a circle has a radius of 5 cm, what is its area?

Back

A = π(5)² = 25π cm².

Tags

CCSS.7.G.B.4

Front

What is the relationship between diameter and radius?

Back

Diameter (d) is twice the radius (r): d = 2r.

Tags

CCSS.7.G.B.4

Front

What is the diameter of a circle with a circumference of 31.4 cm?

Back

d = C/π = 31.4/π ≈ 10 cm.

Tags

CCSS.7.G.B.4

Front

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

Back

r = d/2.

Tags

CCSS.7.G.B.4

Front

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

Back

C = 2π(7) = 14π m.

Tags

CCSS.7.G.B.4

Front

If the area of a circle is 50π cm², what is the radius?

Back

r = √(A/π) = √(50) ≈ 7.07 cm.

Tags

CCSS.7.G.B.4

Front

What is the circumference of a circle with a diameter of 12 inches?

Back

C = π(12) = 12π inches.

Tags

CCSS.7.G.B.4

Front

What is the area of a circle with a diameter of 10 m?

Back

A = π(5)² = 25π m².

Tags

CCSS.7.G.B.4