Area of a rectangle of length $l$ and breadth $b$ is _______ . 

1. $\frac{l}{b}$
2. $l\times b$
3. $2\times (l+b)$
4. $l+b$ 

General relation of the area of a rectangle having length and breadth as $l$ and b is given by _____.

General relation of the area of a rectangle having length and breadth as $l$ and b is given by _____.