Each exterior angle is 72 degrees
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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
1440 degrees
360
It will have 360 sides.
Providing that it's a regular polygon then: 360/15 = 24 sides