Circumference of Circles

Front

What is the circumference of a circle?

Back

The distance around a circle.

Tags

CCSS.7.G.B.4

Front

If my radius is 10ft, what is my diameter?

Back

20ft

Tags

CCSS.7.G.B.4

Front

What number represents π?

Back

3.14

Tags

CCSS.HSG.GMD.A.1

Front

If my diameter is 19 inches, what is my radius?

Back

9.5 inches

Tags

CCSS.7.G.B.4

Front

What is the circumference of a circle with a radius of 33 ft?

Back

207.2 ft

Tags

CCSS.7.G.B.4

Front

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

Back

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

Tags

CCSS.7.G.B.4

Front

If the radius of a circle is doubled, how does the circumference change?

Back

The circumference also doubles.

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

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

Back

Use the formula r = C/(2π).

Tags

CCSS.7.G.B.4

Front

What is the approximate value of π?

Back

3.14

Tags

CCSS.HSG.GMD.A.1