Question

Find the length of each side of a cube having the total surface area is 194 cm${}^2$.

Answer 1

Given T.S.A. of a cube as $294$ cm${}^2$, we have to find its length $l$.
We know T.S.A. of a cube is equal to $6l^2$. Thus $6l^2=294$ or $l^2=294/6=49$.
Hence $l=7cm$.