Home » 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…

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°.

Related:  The triangle PQR above is