Question

Find the area of a rectangle given that its perimeter is 126 cm and breadth is 13 cm.​

Answer 1

perimeter is 126 cm

breadth is 13 cm.

area of rectangle=l+b

step 1

find length

l+13=126

l=126-13

l=113

step 2

113+13=126

126=126

0=0

Answer 2

$\bf{Area\:of\:Rectangle = Length\times Breadth}$

$\longrightarrow\rm{Area\:of\:Rectangle = Length\times 13\:cm\quad...\:Since\:Breadth=13 \:cm}$

$\longrightarrow\rm{Area\:of\:Rectangle = (Perimeter - 2\times Breadth)/2\times 13\:cm}$

$\longrightarrow\rm{Area\:of\:Rectangle = (126\:cm - 2\times 13\:cm)/2\times 13\:cm}$

$\longrightarrow\rm{Area\:of\:Rectangle = (126\:cm - 26\:cm)/2\times 13\:cm}$

$\longrightarrow\rm{Area\:of\:Rectangle = 100\:cm/2\times 13\:cm}$

$\longrightarrow\rm{Area\:of\:Rectangle = 50\:cm\times 13\:cm=650\:cm^2}$