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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.​

 Jul 14, 2022
 #1
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3 sides   angle sum 180 degrees

4 sides   angle sum =  2*180 degrees

n sides   angle sum =  (n-2)*180 degrees

 

so what is the angle sum of a decagon

 

Once you know that you just have a simple equation to solve.

 Jul 15, 2022

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