Question

EXERCISE 21.1
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The area of a rectangle is 84 cm and its breadth is 12 cm. Find its length and perimeter
On The perimeter of a square is 144 cm. Find its area​

Answer 1

Step-by-step explanation:

area of rectangle is 84 cm^2

breadth=12cm

length=? let length is x cm.

we know that

length×breadth=area of rectangle

x×12=84

x=84/12

x=7 cm.

perimeter of rectangle

2(l+b)

2(7+12)

=38 cm.

perimeter of square=144

4×side=144

side=144/4

side=36 cm

area of square

side^2

36^2=1296cm^2