Question

Derive the general rule for the perimeter of the rectangle?
( use $l$ and $b$ for length and breadth of the rectangle respectively)

• A. $2(l+b)$
• B. $2l$
• C. $2b$
• D. $(l+b)$

Answer 1

The correct option is A $2(l+b)$

We know that,
rectangle has opposite sides of equal length.


$\therefore$ Length of side AB = Length of side CD
Length of side BC = Length of side AD

now,

perimeter of rectangle
= Length of side AB + Length of side BC + Length of side CD + Length of side DA
= $l+b+l+b$
= $2l+2b$
= $2(l+b)$