Question

if each exterior angle of a regular polygon measures 20 degree what is the sum of its interior angle​

Answer 1

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➡️So there are 18 exterior angles. This also means that there are 18 vertices and 18 interior angles. Since each interior/exterior pair is supplementary and since the exterior angle is 20, the interior angle is 180-20 = 160 degrees. for the sum of all the interior angles.

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Answer 2

Answer:

160 degrees

Step by step explanation :

So there are 28 exterior angles. This also means that there are 18 vertics and 18 interior angles. S inch each interior /exterior pair is supplementary and since the exterior angle is 20, the interior angle is 180-20 = 160 degree.