Square or rectangle
Solid cylinder (including ends) Triangle
Regular polygon A = (b x h x n)/2 Circular ring
Note: A = surface area; ID = inner diameter; OD = outer diameter; L = length; W = width; R = radius; Rr = ring radius (circular ring); rc = cross section radius (circular ring); X, Y = longest and shortest distances through the center of an ellipse; n = 3.14; h = height; b = base length; p, q = length of the parallel sides of a trapezoid; n = number of sides of a polygon; ro = 1/2 OD; ri = 1/2 ID.
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