Question

11. The perimeter of a rectangle is 120 cm. and it length is 40 cm. Find the
area of the rectangle.
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Answer 1

Answer:

Area of rectangle is 800 cm^2

Step-by-step explanation:

perimeter of rectangle = 2(l+b)

           120                     = 2(40 + b)

           120                     = 80 + 2b

            120-80              = 2b

               40                  = 2b

                      20           =   b

so, Area of rectangle = l*b

                                   = 40*20

                                    = 800 cm^2

 I hope you understand this question

Answer 2

Step-by-step explanation:

p=120cm

l=40cm

A=?

first we have to find the breadth

P of a rectangle=2(L+b)

2(40+b)=120cm

40+b=120÷2

b=60-40

b=20 cm

now we can find the area easily

area of rectangle=L×b

A=40×20cm

A=800cmsq