Question

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1. Find the perimeter of a rectangular field having length 85 m and breadth 65
2. Find the length of a rectangle whose perimeter is 90 cm and sides are in the ratio of 5:4.
3. Find the cost of fencing a rectangular
park with length 10 m and breadth 7 m, at the rate​

Answer 1

1.

Ans - Length - 85m & Breadth - 65 m

Perimeter of rectangular field = 2×(85+65)

= 2× 150

= 200m

2.

Ans - Sides of the rectangle are in the ratio of 4:5

Let the length l=5x

and the breadth b=4x

Now, perimeter =2(l+b)=90cm

2(5x+4x)=90

2(9x)=90

18x=90

x=5

Therefore, Length l=5x=25cm

and the breadth b=4x=20cm

3.

Ans - Given, length = 175m and breadth = 125m

cost of fencing rate = Rs. 12

cost of fencing park =perimeter×rate

=2(l+b)×12Rs

=2(175+125)×12Rs

=2×300×12Rs

=7200Rs