Circles Diameter Radius

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

• 10π

• 10

• 50

• 50π

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.3.MD.D.8

If the problem ask you to find the distance around a 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

The definition of radius is

• distance from one point to another point

• distance around the circle

• distance from the center to any point on the circle

• distance across the circle through the center

Tags

CCSS.HSG.C.A.2

The definition of diameter is

• distance from the center of any point on the circle

• distance across the circle through the center

• distance from one point to another

• distance around the circle

What is the formula for finding diameter?

• r = 2 d

• d = 2 r

• a = m c²

• c = π 2 r

Tags

CCSS.7.G.B.4

Find the radius of the circle

• 20 ft

• 10 ft

• 5.5 ft

• 10 inches

Tags

CCSS.7.G.B.4