Question

how many sides does a regular polygon have if the measure of an exterior angle is a)24 b)18 c)12

Answer 1

a regular polygon have 6 sides

Answer 2

It depends on the formula as:

exterior angle =  360/number of sides

or number of sides = 360/exterior angle

In your case:

for (a) 360/24 = 15 sides

for (b) 360/18 = 20 sides

for (c) 360/12 = 30 sides

Hope it helps.