By bisecting an angle of 30 degrees using a compass and a straight edge
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A 15 degree angle.
it is an acute angle.
Use a protractor.
It does not need to be. It can be smaller or larger.
remember this formula for the number of sides = n sum of internal angles of a regular polygon = [2x(n-2)x90 degree] each interior angle of a regular polygon = [2x(n-2)x90 degree]/n each exterior angle of a regular polygon = 360 degree/n for your question: each exterior angle of a 15 sided regular polygon = 360 degree/15 = 24 degree