Which one of the following formulas will find the sum of interior angles of a polygon with n sides
180(n-2)
180(n-360)
180(n-1)
180n

if you have the answers to this semester exam then i need them.

Every added angle to a polygon adds another 180 degrees to the sum of the angles. The starting point is 180 degrees for a triangle (n=3). So the general formula is 180*(n-2). Fill in n=3 to test if 180 comes out, it does!!

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