Question
If ratio of interior & exterior angle of a regular
polygon is 4:5, then number of sides of the polygon isSolution
We know that I + E = 180 & I :E = 4:5 Let I = 4k & E = 5k So 4k + 5k = 180 or 9k =180 or k = 20 ; It means exterior angle = 20 = 360/N or N = 360/20 = 18
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