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 Description  
 Area of a Polygon:  A measurement of the region enclosed by the sides of a polygon. The area is always expressed in squared units.
Common formulas for finding the areas of different polygons are listed below:

Square: A = s2 (s = length of a side)

Rectangle: A = l*w (l = length and w = width)

Parallelogram: A = b*h (b = base and h = height)

Triangle: A = (1/2)*b*h (b = base and h = height)

Trapezoid: A = (1/2)*h*(b1 + b2) (h = height, b1 = base, and b2 = other base )