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d = 2r
circumference = 2 πr
area = πr2






volume = πr2 h
area = 2 πrh






volume = 4/3 πr3
volume of hemisphere = 1/2 (4/3 πr3 )
area = 4 πr2

How to put mathematical symbols in webpage for example like ≥ , ∝ and  ⊃ ?  Or is it possible to put all those symbols?