Question

A triangle park has sides 120m, 80m, 50m. A Gardner has to put a fence all around it and also plant grass inside , find the cost of fencing it with a wire at rs.20 perimeter and how much area does she need to plant.
PLEASE URGENT ​

Answer 1

Step-by-step explanation:

250 m perimeter

fencing cost is 5000

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Answer 2

Answer:

Step-by-step explanation:

given the sides of the triangular park are 120m, 80m and 50m.

perimeter of the triangular park = 120m + 80m + 50m

= 250m

therefore it's semi-perimeter = 250/2

= 125m

\tt \small \: area \: of \: the \: triangular \: park \: by \\  \tt \small herons \: formula =   \scriptsize {\sqrt{s(s - a)(s - b)(s - c)} } \\  \tt \footnotesize =  \sqrt{125(125 - 120)(125 - 80)(125 - 50)}  \\  \tt \footnotesize =  \sqrt{125 \times 5 \times 45 \times  75}  \\  \tt \footnotesize =  \sqrt{2109375}  \\  \tt \small = 1452.36 {m}^{2}  \:  

hence, the gardener have to plant grass in 1452.36m²

now we have to find the cost of fencing the field with a barbed wire at the rate of rs 20 per m leaving a space of 3m wide for a gate.

therefore the gardener have to fence = 250 - 3

= 247m

so total cost of fencing at the rate of rs 20 per meter = 247 × 20

= rs 4940

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