Its about angles of properties of polygons . It says that each exterior angle of

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secondary 2 Maths Singapore

Its about angles of properties of polygons . It says that each exterior angle of a regular polygon is 40° and calculate the number of sides of the polygon and the sum of the interior angles of the regular polygons

Date Posted: 4 years ago

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a) Total exterior angle for regular polygon =360
n x 40 = 360
n = 360/40
n = 9
Number of side = 9.
b) Formula = (n-2) x 180
= (9-2) x 180
= 1260
Or
Exterior angle = 180 - interior angle
= 180-40
= 140
9 sided polygon
= 140 x 9= 1260
Hope this helps

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