Angle Properties in Polygons

we learned how to find the sum of interior angles using (s-2)180. This only works with convex polygons not concave, to be convex no angles can be bigger than 180

We also learned about the sum of exterior angles, as shown in the diagram below

w=180-A

x=180-b

y=180-c

z=180-d

s=w+x+y+Z = (180-a)+(18o-b)+(180-c)+(18o-d)= 720-a-b-c-d

720 -1(a+b+C+D)

720-360= 360

this is how we found out the exterior angle sum for this 4 sided figure.

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