Area of a Circle

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

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 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 circle has a circumference of 16π cm.  Find the area of the circle.

• 64π cm²

• 256π cm²

• 1024π cm²

• 8π cm²

Tags

CCSS.7.G.B.4

What is the area of a quarter circle if the diameter is 14 cm?

• 12.25π cm²

• 49π cm²

• 14π cm²

• 3.5π cm²

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

What is the area of this semi-circle? Round to the nearest hundredth!

• 50.27 cm²

• 100.53 cm²

• 201.06 cm²

• 25.13 cm²

Tags

CCSS.7.G.B.4