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Polygon Sum of Interior Angles:
(n-2)*180
Polygon Sum of Exterior Angles =
360 degrees
Angles of a Regular Polygon
Each interior Angle: ((n-2)180)/n
Each exterior Angle: 360/n
Equilateral Triangle Area:
half x half x sqrt3
Trapezoid Area:
((a+b)/2)h
Dividing Quadrialterals:
Square and Rhombus: 4 equal angles
Rectangle and Parallelogram: equal opposite angles

Regular Polygon Area
(sh/2) * num of triangles (eg a pentagon will have 5 triangles)
Maximizing Polygon Area
The regular form (all sides equal) of a polygon of n sides will always have the largest area if you keep the perimeter constant