Question

area of rectangle is 21 if perimeter of rectangle is 20m find length and breadth​

Answer 1

Answer:

area of rectangle is =l×b

21=l×b ...........@

perimeter=20

2(l+b)=20

=l+b=10

l=10-b put in @

we get 21=(10-b)×b

21=10b-b square

=b square -10b+21

b square -7b-3b+21

b(b-7)-3(b-7)

(b-3)(b-7)=0

b=3or b=7

if b is 3 then l=7

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