FIND THE NUMBER OF SIDES OF A REGULAR POLYGON ,THE SUM OF WHOSE INTERIOR ANGLE IS 1620 DEGRESS
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Answered by
21
11 sides... assuming all the angles are equal, number of angles=number of sides,now a triangle has 3 sides with sum of angles 180 degrees, quadrilateral which is made up of 2 triangles=180×2=360 degrees and so on..... so 1620÷180=9 and 9+2=11(since the multiple 1 represent a triangle,2 a quadrilateral and so on....so add 2 to multiple to get sides).... message if need help for understanding.
Answered by
73
The number of edges (sides) is 'n'
The sum of all the interior angles of any regular polygon = ( n - 2 ) x 180
Therefore , ( n - 2 ) x 180 = 1620
( n - 2 ) = 1620 / 180
( n -2) = 9
n = 9 + 2
n = 11
The sum of all the interior angles of any regular polygon = ( n - 2 ) x 180
Therefore , ( n - 2 ) x 180 = 1620
( n - 2 ) = 1620 / 180
( n -2) = 9
n = 9 + 2
n = 11
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