ratio of inner and outer angle of aregular polygon is 7:2. what is each angle?how many sides does the polygon have?
 

as its total sum = 180 because sum of interior angle and exterior angel = 180
lets take x as constant = 7x and 2x
= 9x = 180
x = 180 / 9 
x = 20
fst angel = 7x = 7 * 20 = 1400
secondangle = 2x = 2 * 20 = 400
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inner angle = 7/9 x 180 = 140
outer angle = 2/9 x 180 = 40
no: of sides = 360/40 = 9
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