if the difference between the exterior angle of a n sided polygon and n-1 sided polygon is 12, Find the value of n
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Sum of exterior angle of a polygon is 360°
An n-sided polygon has n equal exterior angles.
360/n - 360/(n + 1) = 12
360(n + 1) - 360n = 12n(n + 1)
12n^2 + 12n = 360
n^2 + n - 30 = 0
(n - 5)(n + 6) = 0
n = 5 or n = -6
Therefore, n = 5
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