RRB NTPC Mains or Stage 2 Model Paper 1 with solutions

Question : 101 of 120

Marks: +1, -0

The number of sides of a regular polygon whose interior angles are each 150° is :

Solution:

(3) Each interior angle of regular polygon

={(2n – 4)× 90°}/n

∴{(2n –4 )× 90}/n= 150

⇒ 2n – 4 ={150×n}/90

⇒6n – 12 = 5n
⇒ 6n – 5n = 12
⇒ n = 12

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