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Assuming the polygon is regular with an interior angle of 172.8o then it has 50 sides.

For all polygons:

exterior_angle + interior_angle = 180o

⇒ exterior_angle = 180o - interior_angle

sum_of_exterior_angles = 360o

If the polygon is regular all angles are the same and:

sum_of_exterior_sides = number_of_sides x exterior_angle (= 360o)

⇒ number_of_sides = 360o ÷ exterior_angle

= 360o ÷ (180o - interior_angle)

Assuming your polygon is regular with each interior angle 172.8o then

number_of_sides = 360o ÷ (180o - 172.8o)

= 50 sides

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12y ago
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Q: How many sides would a polygon add if the degree is 172.8?
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