The perimeter of a triangle is 51 M and its breadth is 12 m find its length and area

are u sure it is a triangle?
if yes so pls check the question
 
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assuming your question to be of a rectangle,
perimeter=51m
breadth=12m
length=?
area=?
perimeter of a rectangle=2(l+b)
                                 51=2(l+12)
                               l+12=51/2=25.5
                               l=25.5-12=13.5 m
area of a rectangle=
l*b=13.5*12=162 m2
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