Q. 24.4( 75 Votes )

The volume of a c

Answer :

Let a be the length of a side, V be the volume and S be the surface area of the cube.

Then, V = a³ and S = 6a² where a is the function of time t.

Now, It is given that

Then, by using the chain rule, we get,

………………(1)

So, when a = 12cm, then,

Therefore, if the length of the edge of the cube is 12cm, then the surface area is increasing at the rate of .

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