Question

In the adjoining plot of land,All the adjacent sides are at right angles. find :
a) perimeter of the plot
b) cost of fencing at the rate of ₹11.40 per meter ​

Answer 1

Answer:

a) 38

b) Rupees 433.2uhhhhh

Answer 2

Answer:

84,000

Step-by-step explanation:

Area of parallelogram ABCD

=2×(area of ΔABC) …(i)

First of all, we need to find the area of ΔABC which is the same as the area of ΔADC.

∴s=

2

39+25+56

=

2

120

=60

∴Area ofΔABC

=

s(s−a)(s−b)(s−c)

=

60(60−39)(60−25)(60−56)

=

60×21×25×4

=2×2×3×5×7

=420sq.m

∴ Using relation (i), we will get the area of parallelogram ABCD

i.e. area of parallelogram ABCD

=2×420

=840sq.m.

∵ Cost of levelling 1sq.m is Rs 100

∴ Cost of levelling 840sq.m is 840×100

= Rs 84,000