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Big Ideas Math Geometry, 2014

BI

Big Ideas Math Geometry, 2014 View details

1. Circumference and Arc Length

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Exercise 5 Page 598

Do you remember the formula for the circumference of a circle?

14 units

Practice makes perfect

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 28π. By substituting 28π for C in the formula, we can calculate the radius of the circle, r.

C=2π r

C= 28π

28π=2π r

.LHS /2π.=.RHS /2π.

28π/2π=r

Calculate quotient

14=r

Rearrange equation

r=14

We found that the radius is 14 units.

Subchapter links

Communicate Your Answer p.593

Monitoring Progress p.594-597

Exercises p.598-600