Question

A rectangular field has perimeter 186cm and breadth 35m .find the length.

Answer 1

Perimeter of rectangle=2(l+b)
=>186=2(l+35)
=>186=2l + 70
=>2l = 116
=>l = 58.



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Answer 2

Perimeter of a rectangle is the sum of all sides

Now let length be l.

Let breadth be b.

Perimeter = l+l+b+b

==> 2 l + 2 b

So:

2 l + 2 b = 186 m

==> 2 ( l + b ) = 186 m

==> l + b = 186 m / 2

==> l + b = 93 m

But b is given to be 35 m

==> l + 35 m = 93 m

==> l = 93 m - 35 m

==> l = 58 m

The length of the field is 58 m

Hope it helps you

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