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Find the value of y if the measures of the interior angles of a convex decagon are 5yº, 5yº, 8yº, 8yº, 9yº, 9yº, 9yº, 9yº, 9yº, and 9yº.​

 Sep 22, 2021
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Sum of convex decagon interior angles = 1440                 ( that is (10-2  * 180)   )

 

(5 *2 + 8*2 + 9*6) y = 1440

 

80y = 1440     solve for y

 Sep 22, 2021

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