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Two circles are in the interior of angle A, and are tangent both to each other and to both sides of∠A. If their radii are in the ratio 17:25, then find cos A.

 Jun 14, 2020
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Two circles are in the interior of angle A, and are tangent both to each other and to both sides of∠A. If their radii are in the ratio 17:25, then find cos A.

 

sin (A/2) = ( 25-17) / (25+17)

 

cos (A) = ?  smiley

 Jun 14, 2020

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