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Question

The ratio of the measure of an interior angle of a regular octagon to the measure of each of its exterior angles is

Options:
A .  1 : 2
B .  1 ; 3
C .  2 ; 3
D .  3 ; 1
Answer: Option D

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For any polygons,
ext. angle = 360/n, where n is the no. of side in polygon. (ext. = 360/8 = 135 , here n=8 in the case of regular octagon)
int. angle = 180 - ext. angle i.e., 180 - (360/n). (int. = 180 - 135 = 45)
so ratio of int. angle/ext. angle = 135/45 = 3/1

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