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McGraw Hill Integrated II, 2012 View details

1. Circles and Circumference

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Exercise 43 Page 721

Read the radius from the map and use it to evaluate the circumference of a circle.

≈ 471.2 feet

Practice makes perfect

We are given that the Indian Shell Ring on Hilton Head Island approximates a circle and we want to find the circumference of this circle. First let's recall the formula for the circumference of a circle. C=2π r From the given map we can see that the radius of the circle is 3 units, which corresponds to 3*25= 75 feet. Now we will substitute radius into the circumference formula.

C=2π r

Substitute

r= 75

C=2π ( 75)

UseCalc

Use a calculator

C=471.2388...

RoundDec

Round to 1 decimal place(s)

C≈ 471.2

We would have to walk approximately 471.2 feet to go completely around the ring.