What is the area of a square with side length $7cm$?

We know that the area of a square can be found by the following expression:

$Area=side\times side$

Now, we are given the side of the square as: $7cm$

Substituting this side length in the expression mentioned above, we get:

$Area=7cm\times 7cm$

Simplifying which we get:

$Area=49c{m}^2$

Thus, the area of the given square is found to be option (C) $49c{m}^2$.