A plot of land is in the shape of a right angled isosceles triangle. The length of the hypotenuse is 50*sqrt(2). The cost of fencing it at Rs.3 per metre will be:
OPtion
1) Less than Rs.300
2) Less than Rs.100
3) Less than Rs.400
4) Less than Rs.200
5) More than Rs.700
6) More than Rs.500
7) More than Rs.600
8) Less than Rs.500
9) More than Rs.800
10)None of these
Solution
Let each one of equal sides be x metres.
Then x^2+x^2 = (50*sqrt(2))^2
x = 50 m.
Perimeter = x + x + 50*sqrt(2) = 100 + 50*sqrt(2)
Therefore cost of fencing = Rs.3 * (100 + 50*sqrt(2))
= 511.5
More than Rs.500