### Theory:

Now, we shall find the area of a rectangle.

Let us consider a rectangle $$ABCD$$ whose length is $$l \ units$$ and breadth is $$b \ units$$.

Then, the area of the rectangle is given by:
Area of the rectangle $$=$$ Product of length and breadth
Area of the rectangle, $$A=length \times breadth$$

$$A=l\times b$$ $$sq. units$$

Therefore, the area of the rectangle is $$l\times b$$ $$sq. \ units$$.
Example:
1. If the length of the rectangle is $$5 \ cm$$, and the breadth of the rectangle is $$3 \ cm$$, find the area of the rectangle.

Solution:

The length of the rectangle is $$l=5 \ cm$$.

The breadth of the rectangle is $$b=3 \ cm$$.

Area of the rectangle $$=$$ Product of length and breadth

Area, $$A=l \times b \ sq. units$$

Substituting the values in the formula, we have:

$$A=5 \times 3 \ sq. cm$$

$$A=15 \ sq. cm$$

Thus, the area of the rectangle is $$15 \ sq. \ cm$$.