posted by Monica .
A regular polygon has an exterior angel measure of (x+3) Degrees and an interior angle measure of (13x-33) degrees
Find the measure of each angle
How mant sides does this polygon have?
Look at a pair of interior and exterior angles.
Don't they form a straight line, so
13x-33 + x+3 = 180
14x = 210
x = 15
each exterior angle is 18°
and each interior is 162°
the sum of all exterior angles is always 360
so each angle is 360/18 or 20 angles
20 angles ----> 20 sides