Question

rectangle l=15cm, perimeter =40cm find its area​

Answer 1

Answer:75cm^2

Step-by-step explanation:

L=15cm

Perimeter=2(l+b)

                 =40cm

Let breadth be b

Therefore,

=2(15+b)=40

=(2×15)+(2b)=40

=30+2b=40

=2b=40-30

      =10

=b=5

Area=l×b

       =15×5

       =75 cm^2

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Answer 2

Answer:

the area of rectangle is 75 cm

Step-by-step explanation:

perimeter=2( length+breath)

40=2(15+b)

40/2=15+b

20=15+b

20-15=b

5=b

breath=5 cm

now,

area of rectangle=lenght×breath

= 15cm × 5cm

= 75 cm

area of rectangle is 75 cm

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