Some of the many are:-
Area of a circle: pi*radius2
Circumference of a circle: 2*pi*radius or diameter*pi
Volume of a sphere: 4/3*pi*radius3
Surface area of a sphere: 4*pi*radius2
Volume of a cone: 1/3*pi*radius2*height
Volume of a prism: area of cross-section*length
Pythagoras' theorem: a2+b2 = c2
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