B The ratio of exterior angle to interior angle of a regular polygon is 1:4. Find the number of sides of the
polygon.
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Step-by-step explanation:
Let exterior angle = x° & interior angle = 4x°
∴ 4x + x = 180°
5x = 180°
x = 36°
∴ each exterior angle = 36°
Let no. of sides = n
∴ 360° /n = 36°
n = 360° /36°
n = 10
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