Circles in Terms of Pi

Front

What is the formula for the area of a circle?

Back

Area = πr², where r is the radius.

Tags

CCSS.7.G.B.4

Front

What is the formula for the circumference of a circle?

Back

Circumference = 2πr or Circumference = πd, where d is the diameter.

Tags

CCSS.7.G.B.4

Front

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

Back

25π cm².

Tags

CCSS.7.G.B.4

Front

If a circle has a circumference of 40π inches, what is its diameter?

Back

40 inches.

Tags

CCSS.7.G.B.4

Front

What is the relationship between diameter and radius?

Back

Diameter = 2 × Radius.

Tags

CCSS.7.G.B.4

Front

If a circle has a diameter of 12 ft, what is its area?

Back

36π ft².

Tags

CCSS.7.G.B.4

Front

If a circle has a circumference of 18π feet, what is its area?

Back

81π ft².

Tags

CCSS.7.G.B.4

Front

If a circle has an area of 16π in², what is its radius?

Back

4 inches.

Tags

CCSS.7.G.B.4

Front

What is the value of π (Pi)?

Back

Approximately 3.14, but it is an irrational number.

Tags

CCSS.HSG.GMD.A.1

Front

How do you convert diameter to radius?

Back

Radius = Diameter / 2.

Tags

CCSS.7.G.B.4