Question

The length of a rectangle is 10 cm and its perimeter is equal to that of a square of
side 9 cm Find the area of rectangle​

Answer 1

Given:

• Length of the rectangle =10cm
• Side of square= 9cm

To find:

• Find the area of rectangle

Solution:

$\tiny \fbox \blue{Perimeter of square=4a}$

• 4×9=36cm

Perimeter of square=Perimeter of rectangle

• 2(l+b)=36
• 2(10+b)=36
• 2b+20=36
• 2b=16
• b= 8

$\colorbox{lime}{Area = l×b}$

• = 10×8
• = 80cm²
• Hence the answer is 80cm²