Question

the perimeter of rectangle is 108cm.if its length is 34 cm , then area of the rectangle in cm it

Answer 1

680is the area of required answer
perimeter=2(l+b)

Answer 2

aloha user!
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we know that the perimeter of rectangle is 2(l+b)
the length is given to be 34 cm and perimeter is given to be 108 cm

so,

2(l+b) = perimeter
2(34 + b) = 108
34 + b = 54
b = 54 - 34
b = 20 cm

the area of rectangle is length × breadth => 24 × 20 => 480 cm² 
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hope it helps :^)