find the sum of interior angles polygon with (i) 14 sides (ii) 18 sides (iii) 23 sides (iv) 80 sides
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Step-by-step explanation:
(i) 18 sides
No of sides = n = 18
Sum of interior angles of polygon = (2n-4) x 90
= (2 x 18 - 4) x 90
= 32 x 90 = 2880
(ii) 23 sides
No of sides = n = 23
Sum of interior angles of polygon = (2n-4) x 90
= (2 x 23 - 4) x 90
= 42 × 90 = 3780
(iii) 80 sides
No of sides = n = 80
Sum of interior angles of polygon = (2n-4) x 90
= (2 x 80 - 4) x 90
= 156 x 90 = 14040
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