What is the quarter circle's radius?

asked Jun 8, 2019 29.7k views

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by Pdobb

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Perimeter of the quarter circle =
$2 \pi r+r+r$

$2 \pi r+r+r$ = 17.65km

$2 \pi r+2r$ = 17.65

$2r( \pi +1)$ = 17.65

2r(4.14)

= 17.65

= 17.65 ÷ 4.14

2r = 4.263

r = 2.13 (nearest hundredth)

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