# Chapter 5 - Section 5.3 - Multiplying Decimals and Circumference of a Circle - Exercise Set: 55

$C=2\times9.1\pi=18.2\pi\approx 18.2\times3.14=57.148$ square yd.

#### Work Step by Step

The circumference of a circle can be calculated as: $C=2r\pi=d\pi$ where r is the radius and d is the diameter. Here: $r=9.1$ yd $C=2\times9.1\pi=18.2\pi\approx 18.2\times3.14=57.148$ square yd.

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