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The ratio of the interior to exterior angle of a regular polygon is 4:1. How many sides does the polygon have?
A6
B8
C12
D10
Answer & Solution
Correct answer: D. 10
1. Interior + exterior = 180°, and ratio 4:1 means exterior = 180/5 = 36°.
2. Number of sides = 360° / exterior angle = 360 / 36.
3. = 10 sides.
_Source: RRB Group D CEN-02/2018 PYQ, Q.24._
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