Question

the lenght of a rectangle is 20 cm its breadth is 4 cm what is it area ?
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Answer 1

Answer:

Hello, A Rectangle has two sides, one is it's Breadth and another is it's Length.

So , in your question , we have to find the Length of the Rectangle.

Given that ,

Perimeter of the Rectangular is 20 cm.

And Breadth is 4.5 cm.

Let us take , the Length of the Rectangle is x.

Then , we have,

20 = [(4.5 + x)×2]

Or, 20 = 9 + 2x

Or, 11 = 2x

Or, x = 11/2 = 5.5

Therefore, the Length of the given Rectangle is 5.5 cm.

Answer 2

Step-by-step explanation:

Length = 20

Breadth = 4

Perimeter = 2(L+B) = 2*24 = 48

Area = 20*4 = 80

New Perimeter = 48-8 = 40

New area = 80+16 = 96

If the new length is x, the new breadth will be (40-2x)/2 = 20-x

so x(20-x) = 96

x will be 8

so the new length and breadth will be 12 and 8