# If is the Volume of a Cuboid of Dimensions a × B × C and ‘S is Its Surface Area, Then Prove That: 1/V = 2/S1/A +1/B + 1/C - Geometry

Sum

If ‘V’ is the volume of a cuboid of dimensions a × b × c and ‘S’ is its surface area, then prove that: 1/V = 2/S[1/a +1/b + 1/c]

#### Solution

The volume (V) of a cuboid = a x b x c

:. 1/V = 1/(abc) .......(1)

The surface area (S) of a cuboid = 2(ab + bc + ca)      .....(2)

2/S = 1/(ab+bc+ac)

RHS = 2/S (1/a +  1/b + 1/c)= 1/(ab +bc+ac)(1/a+1/b+1/c)

2/S xx (1/a+1/b+1/c) = 1/(abc)

:. 2/S xx(1/a+ 1/b + 1/c)= 1/V

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