## Basic College Mathematics (9th Edition)

Published by Pearson

# Chapters 1-9 - Cumulative Review Exercises: 20

#### Answer

$C = 28.26$ $A = 199.7$

#### Work Step by Step

The formula for circumference is $2\times\pi\times(radius)$ or $\pi\times(diameter)$ 1. The diameter is 9 so we multiply $9\times\pi\approx28.26$ The formula for area is $(\pi\times radius)^{2}$ 2. $(\pi\times4.5)^{2} = 199.7$

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