Circumference and Area of Circles

A circle has a circumference of 9π in. What is the area?

• 81π in²

• 4.5π in²

• 20.25π in²

• 9π in²

Tags

CCSS.7.G.B.4

Randy’s circular garden has a radius of 1.5 feet. He wants to enclose the garden edging that costs $0.75 per foot. About how much will the edging cost? Use 3.14 for π!

• $9.42

• $7.07

• $3.53

• $4.71

Tags

CCSS.7.G.B.4

What is the area of the yellow?

• 25π m²

• 5π m²

• 6.25π m²

• 1.25π m²

Tags

CCSS.HSG.C.B.5

A ball has a circumference of 9.42 cm. What is the diameter?  Round to the nearest hundredth!

• 29.59 cm

• 4.71 cm

• 3 cm

• 18.84 cm

Tags

CCSS.7.G.B.4

A glass stained window is shaped like a semicircle. The bottom edge of the window is 36 inches long. How much colored glass would you need to cover the stained window? Round to the nearest hundredth.

• 1017.36 in²

• 508.68 in²

• 56.52 in

• 113.04 in

Tags

CCSS.7.G.B.4

A circular ground has an area of 144π sq ft. Jenny rides the bike around it. How far does she travel to complete a single round? 

• 72π ft

• 12π ft

• 24π ft

• 6π ft

Tags

CCSS.7.G.B.4

A circular swimming pool is 21 feet in diameter.
How many feet around is the pool? Round to the nearest hundredth!

• 32.99 ft

• 42 ft

• 65.97 ft

• 131.95 ft

Tags

CCSS.7.G.B.4

What is the perimeter of this semi circle?

• 8π cm

• 4π cm

• 2π cm

• 16π cm

Tags

CCSS.7.G.B.4

If the word problem is asking you to find the space inside the circle, which formula should you use?

• r = d/2

• d = 2r

• C = πd

• A = πr²

Tags

CCSS.7.G.B.4