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Question

Geometry:

If the Sum of the interior angles of a regular polygon is 14 right angles, then its number of sides, is ___

  • 6
  • 7
  • 8
  • 9
  • None of these
Answer- D

Using the formula of Sum of all interior angles of a regular polygon is = (2n-4) x 90 where n is number of sides.

As per the question it is equal to 14 right angles.

14 x 90 = (2n-4) x 90

=> 14 = 2n – 4 => 2n= 18 => n= 9