Perimeter Formulas
| 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) E(k,pi/2) is the Complete Elliptic Integral of the Second Kind k = (1/radius1) * sqrt(radius12 - radius22) |
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