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One interior angle of a convex polygon (a convex polygon is a polygon where all anglesare less than 180 degrees) is 120 degrees. All the other angles are 130 degrees. How many sides does the polygon have?

 Aug 17, 2021
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120  +  130 (n-1) = 180 (n-2)

120   +  130n -130 = 180n-360

350 = 50n

n=7

 Aug 17, 2021

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