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Which of the following is not the the size of an exterior angle of a…

Which of the following is not the the size of an exterior angle of a regular polygon?

  • A.
    15o
  • B.
    18o
  • C.
    20o
  • D.
    21o
Correct Answer: Option D
Explanation

The size of an exterior angle = (frac{360}{n})

From the options, all options can perfectly divide 360°, except 21°.