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OpenStudy (anonymous):
Find the number of diagonals of a regular polygon whose interior angle measures 144 degrees?
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ganeshie8 (ganeshie8):
what regular polygon has an interior angle measure of 144 degrees ?
ganeshie8 (ganeshie8):
exterior angle = 180-144 = 36 number of sides = 360/36 = 10 that means the polygon is a decagon, yes ?
OpenStudy (anonymous):
yep but my classmates answered 35. how they get 35 ??
OpenStudy (anonymous):
ty bro. :D
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ganeshie8 (ganeshie8):
are you looking for a derivation for the n(n-3)/2 formula
ganeshie8 (ganeshie8):
?
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