Area and Circumference of Circles

If the area of circle is 100π.  Find the radius of the circle.

• 10π

• 10

• 50

• 50π

Tags

CCSS.7.G.B.4

If the circumference of a circle is 28π, what is the radius of the circle?

• 28

• 14

• 56

• 196

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

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

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

What is the perimeter of this semi circle?

• 8π cm

• 4π cm

• 2π cm

• 16π cm

Tags

CCSS.7.G.B.4

What is the perimeter of this semi circle?

• 3.6π m

• 7.2π m

• 14.4π

• 12.96π

Tags

CCSS.7.G.B.4