It varies by the shape. Anything sort of circular usually involves equations with Pi, but objects with corners are different. Since Fixya will not allow me to type equations very well here, I'll refer you to http://www.cliffsnotes.com/math/geometry/perimeter-and-area/formulas-perimeter-circumference-area http://www.coolmath.com/reference/perimeters.html http://www.mathsisfun.com/geometry/ellipse-perimeter.html http://math2.org/math/geometry/areasvols.htm
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It varies by the shape. Anything sort of circular usually involves equations with Pi, but objects with corners are different. Since Fixya will not allow me to type equations very well here, I'll refer you to
http://www.cliffsnotes.com/math/geometry/perimeter-and-area/formulas-perimeter-circumference-area
http://www.coolmath.com/reference/perimeters.html
http://www.mathsisfun.com/geometry/ellipse-perimeter.html
http://math2.org/math/geometry/areasvols.htm