Circumference and Area of a

The radius of a circular swimming pool is 6.1 meters. Which is closest to the circumference of this swimming pool?

• 19.48 m

• 74.42 m

• 38.33 m

• 116.90 m

The diameter of a circular pond is 13.7 meters. The circumference is approximately 58.7 meters. Which of these could be used to estimate the value of π?

• d ÷ c = π

• π ÷ c = d

• c ÷ d = π

• d ÷ π = c

How much grass is needed to fill the entire circular lawn?

• 4,418 steps²

• 235 steps²

• 5,625 steps²

• 740 steps²

I want to find out how long I need my string lights to be to decorate my bike. The radius of a tire is 13 inches. How much lighting do I need to decorate both tires?

• 82 inches

• 164 inches

• 530 inches

• 41 inches

The London Eye has a diameter of 120 meters. If you are sitting in one of the capsules, about how far do you travel in one rotation of the Ferris wheel?

• 180 meters

• ^{380 meters}

• ^{11,300 meters}

• 125 meters

Sunshine Preschool has a merry-go-round that measures 36 inches from the center to the edge. What is the circumference of the merry-go-round, in inches? Round to the nearest hundredth!

Mathematical Equivalence

ON

What is the formula for circumference of a circle given the diameter?

• C = π r

• C = 2 π r

• C = π d

• C = 2 π d

• 3.11

• 3.12

• 3.14

• 3.15

Find the area of a circle with a diameter of 6 inches.

When finding area of a circle, if diameter is given, we need to find radius. We can find radius by ___________ diameter by 2.

• Adding

• Subtracting

• Multiplying

• Dividing