Q13 of 99 Page 264

Let us write by calculating that how much length of wall in meter is required for walling outside round the square field, whereas the length of diagonal of the square land is 20√2 meter. Let us write by calculating how much cost will be for planting grass at the rate of Rs. 20 per sq. meter.

We know, that the length of diagonal of square = L√2 units, where L is the side of square


Diagonal of the square = 20√2m


On comparing,


side of the square land = 20m


Also, we know


Area of square = (side)2


Area of the square land = 202 = 400m2


Cost for 1 m2 to plant grass = Rs. 20


Cost for 400m2 to plant grass = Rs. 20 × 400 = Rs. 8000


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