Area/Circumference Circles

Front

What is the formula for 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

What is the formula for the area of a circle?

Back

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

Tags

CCSS.7.G.B.4

Front

How do you find the diameter of a circle if you know the radius?

Back

Diameter (d) = 2r, where r is the radius.

Tags

CCSS.7.G.B.4

Front

If a circle has a circumference of 10π, what is its radius?

Back

Radius (r) = 5.

Tags

CCSS.7.G.B.4

Front

If a circle has a diameter of 16, what is its radius?

Back

Radius (r) = 8.

Tags

CCSS.7.G.B.4

Front

What is the relationship between diameter and circumference?

Back

Circumference (C) = πd, where d is the diameter.

Tags

CCSS.7.G.B.4

Front

How do you convert circumference to area?

Back

Use the formula C = 2πr to find r, then use A = πr² to find area.

Tags

CCSS.7.G.B.4

Front

What is the area of a circle with a radius of 10?

Back

Area (A) = 100π.

Tags

CCSS.7.G.B.4

Front

If a circle has an area of 254.34, how do you find the radius?

Back

Use A = πr² to find r: r = √(A/π).

Tags

CCSS.7.G.B.4

Front

What is the circumference of a circle with a diameter of 40?

Back

Circumference (C) = 40π.

Tags

CCSS.7.G.B.4