----------  *PERIMETERS*  ----------

    Perimeters of Geometric Figures

Square                4 * side
Rectangle             2 * (length + width)
Parallelogram         2 * (side1 + side2)
Triangle              side1 + side2 + side3
Regular n-polygon     n * side
Trapezoid             height * (base1 + base2) / 2
Trapezoid             base1 + base2 + height * [csc(theta1) + csc(theta2)]

Circle                2 * pi * radius
Ellipse               4 * radius1 * E(k,pi/2)
Ellipse               where E(k,pi/2) is the Complete Elliptic
Ellipse               Integral of the Second Kind, and where
Ellipse               k = (1/radius1) * sqrt(radius1**2 - radius2**2)

   Source--Spiegel, Murray R.  Mathematical Handbook of Formulas
           and Tables.  Schaum's Outline series in Mathematics.
           McGraw-Hill Book Co., 1968.