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

2 (l + b)

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2 l

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2 b

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(l + b)

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Solution

The correct option is A $2 (l + b)$
We know that,
rectangle has opposite sides of equal length.

$∴$ 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
= $l + b + l + b$
= $2 l + 2 b$
= $2 (l + b)$

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

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