The surface area and volume of a cube with an edge length of $x \ cm$ are numerically equal. Find the value of $x$.

In $\Delta ABC$,$\angle B = 90^{\circ}$,$AB = 6.3 \, cm$,and $BC = 8.4 \, cm$. If the triangle is revolved about the side $AB$,find the volume of the cone so obtained. Similarly,if the triangle $ABC$ is revolved about the side $BC$,find the volume of the cone so obtained.

The length,breadth,and height of a cuboidal box are $25 \, cm$,$20 \, cm$,and $10 \, cm$ respectively. Find its total surface area in $cm^2$.

Find the curved surface area and the total surface area of a cone with radius $3.5 \, cm$ and height $12 \, cm$.

The total surface area of a cube is $864 \, cm^2$. Then its edge is $\ldots \ldots \ldots \, cm$.

Lateral surface area of a cuboid $= \ldots \ldots \ldots$