Geometric Formulas

 

Circumferences and Areas

Pi = 3.141592653589793238462643383279
Figure   Area
Circle Diameter = R * 2

Circumference = 2 * R * Pi

R * R * Pi
Ellipse Smaller Diameter = 2 * r

Larger Diameter = 2 * R

Circumference = (R + r) * Pi

R * r * Pi
Ring   Pi(R2 - r2)
 
 

 

 


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Circle

Ellipse

Ring

Sector