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Basic Formulas to Know

Circle info:

cicle with radius r
area= pi * r^2
  
circumference= 2 * pi * r

 

Sphere info:

sphere with radius r
volume= ( 4 / 3 ) * pi * r^3
  
surface area= 4 * pi * r^2

 

Cylinder info:

cylinder with radius r

volume = Area of Top x height = pi * r^2 * h

 

Triangle info:

triangle
area= ( 1 / 2 )bh