# Chapter 2 - Reasoning and Proof - Common Core Cumulative Standards Review - Selected Response - Page 136: 10

522.6 yd

#### Work Step by Step

The diameter of the semi-circle at each end of the track is: $d=60+15+15=90$ The radius is half that, or 45. The two semi-circles combine to make one whole circle. Find the perimeter. $p=2\pi r=2(3.14)(45)=282.6$ Add the perimeter of the circular area to the lengths of the 2 straight edges. $p=282.6+120+120=522.6$

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