Question

Find the area of a triangular field, the lengths of whose sides are 90m, 120m and 150m. Also calculate the cost of levelling the field at the rate of Rs.12.50 per sq metre​

Answer 1

Answer:

Dimension of triangle field ⇒120m,80m,50m

⇒ perimeter = 120 + 80 + 50

=250m

Area =

125(125−120)(125−80)125−50

=

125×5×45×75

=

25×5×5×9×5×5×15

=5×5×3×5

15

=375

15

=375(3.88)

=1455m

2

cost of fencing = 250−3

[perimeter of Remaining fence] = 247

Total cost ⇒247m×Rs20/m

=Rs4940.

as the rate are reduced by 25 %

∴ new lets is [20−20×

100

25

]⇒20−5=15%

Rs[4950−4950×

100

25

]

⇒4950(1−

4

1

)

4950×

4

3

Final cost ⇒Rs3712.5