Question

The length of a rectangle is 4 cm more than its breadth.if the perimeter of rectangle is 40 cm find its length and breadth.

Answer 1

$Let \: breadth \:of \: a \: rectangle = b \:cm \\Length (l) = ( b + 4 ) \:cm$

/* According to the problem given */

$Perimeter \:of \:the \: rectangle = 40 \:cm$

$\implies 2( l + b ) = 40 \:cm$

$\implies [( b + 4) + b] = \frac{40}{2}$

$\implies 2b + 4 = 20$

$\implies 2b = 20 - 4$

$\implies 2b = 16$

$\implies b = \frac{16}{2}$

$\implies b = 8 \:cm$

$Now, Length (l) = b + 4 \\= 8 + 4 \\= 12\:cm$

Therefore.,

$\red { Length }\green {= 12 \:cm }$

$\red { Breadth }\green {= 8 \:cm }$

•••♪

Answer 2

Answer:

length =12 cm

breadth=8 cm