SOLUTION: Two angles of a polygon are right angle and the remaining are 120 each.find the no. Of sides in it

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Question 1017368: Two angles of a polygon are right angle and the remaining are 120 each.find the no. Of sides in it
Answer by Alan3354(69443) About Me  (Show Source):
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Two angles of a polygon are right angle and the remaining are 120 each.find the no. Of sides in it
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Sum of angles = 2*90 + (n-2)*120
Sum = 180*(n-2) = 180 + n*120 - 240
180n - 360 = 120n - 60
60n = 300
n = 5