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प्रश्न
Find the number of sides in a polygon if the sum of its interior angle is: 900°
उत्तर
Let no. of sides = n
Sum of angles of polygon = 900°
(n – 2) x 180° = 900°
n – 2 = `900/180`
n – 2 = 5
n = 5 + 2
n = 7
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