Answer:
Explanation:
length = 3x
breadth= 7x
area = 1029m2
area = length × breadth
(3x) × (7x)= 1029
now,
3×7=21
7×7=49
(verification 21×49=1029)
so length = 21
breadth = 49
now perimeter = 2(l+b)
=2(21+49)
=2(70)
= 140
so perimeter = 140m
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