Question

the length of a rectangular plot of land is twice its breadth if the perimeter of plot be 210 find the area.​

Answer 1

Answer:

length = 2b

perimeter = 210

perimeter = 2(l+b)

perimeter = 2(2b+b)

perimeter = 2(3b)

perimeter = 6b

210 = 6b

b = 210/6

b = 35

area = lb

l = 70

area = 70 x 35

area = 2450

Answer 2

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Let the breadth of the plot be' x 'metres

➣Then its length=2x meters

the perimeter =2×(l+b)

=[2×(2x+x)]metres

=6x metres

Now 6x=210

x=35

b=35

l=2×35=70

➣area of the plot =l×b sq. units

=70×35=2450m²