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McGraw Hill Integrated II, 2012 View details

1. Circles and Circumference

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Exercise 56 Page 723

Use the formula for circumference of a circle and solve it for the radius.

A

Practice makes perfect

We want to find the radius of the circle formed by a table. The circumference C of a circle with radius r is calculated using the formula below. C=2π r From the exercise, we know that the circumference of the circle is 10ft. By substituting 10 for C in the formula, we can solve for r.

C=2π r

Substitute

C= 10

10=2π r

Multiply

10=2π r

DivEqn

.LHS /2 π.=.RHS /2 π.

10/2π=r

RearrangeEqn

Rearrange equation

r=10/2π