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how would you doing the measure of the arc? I have tried finding the radius.

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  • $\begingroup$ The problem gives the radius. What you need to find is the angle subtended by $CD$. $\endgroup$
    – dxiv
    Dec 20, 2016 at 2:05
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    $\begingroup$ @dxiv exactly, OP has tried finding the radius... on the page. There it is! $\endgroup$ Dec 20, 2016 at 2:09

1 Answer 1

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The angle inside the triangle at the centre of the circle has a sine given by 36.7 divided by two, divided by 21.6, meaning that the angle is 57.32465 degrees, or 1 radian. Therefore the arc length is twice r*theta, which is 43.2inches.

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