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Suppose the number of sides are n .
We have following equation to find the sum of the interior angles.
[tex](n - 2) \times 180[/tex]
For Example we want to know what sum of the interior angles of triangle equals ?
Triangle has three sides thus ;
[tex]n = 3[/tex]
[tex](3 - 2) \times 180 = 1 \times 180 = 180 \\ [/tex]
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