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Question
Find the number of sides in a regular polygon, if its interior angle is: `1 1/5` of a right angle
Solution
No. of. sides = n
Each interior angle = `1 1/5` right angles
= `6/5 xx 90`
= 108°
`therefore ("n" - 2)/"n" xx 180^circ = 108^circ`
180n - 360° = 108n
180n - 108n = 360°
72n = 360°
n = 5
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