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Equations

 Circle

Circumference = Diameter x 3.146

Diameter = Circumference x 0.31831

Area = Diameter² x 0.7854

OR

Area = Radius² x 3.146

Please Note: Doubling the diameter of a circle or pipe will increase its area by FOUR times 

Square

Diameter of a circumscribing circle = Length of Square x 1.4142

Circumference of a circumscribing circle = Length of Square x 4.443

Length of an equal square = Diameter x 0.8862

Rectangle

 Area = Length x Width

Triangle Area = (Base x Height) / 2
Ellipse Area = Diameterx Diameterx 0.7354

Parallelogram

Area = Base x Height

Inscribed Cube

Length = Radius of Sphere x 1.1547

Sphere

Volume = Diameter3 x 0.5236

Cone

Volume = Diameter of Base2 x Height of Cone x 0.261

Please note this guide is for informational purposes only and should not be used exclusively.