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2015-10-18T23:25:37+05:30

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A)

P = 2(l+b)

P = 2(8)

P = 16 cm

b) let length be 4x & breadth be 3x

ATQ.

A = 12x²

1200 = 12x²

x = 10 m

so , l = 40m

b = 30 m

so , P = 2× 70 = 140m
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2015-10-18T23:50:52+05:30

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
A). Perimeter of a rectangle-= 2(l+b).
=2(5+3)
=16 cm.
b). Perimeter of a rectangle=2(l+b)
Area =1200
l*b=1200
But, l/b=4/3.
4x*3x=1200.
Therefore, l=40 m.
b=30 m.

Perimeter=2(40+30)
=2(70)
=140 m.
Hope this will help you.
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