Question

A triangular part has sides 120m. 80m and 50m. A gardener Ramu has to put fence all around it and also plant grass inside. How much area does she need to plant? Find the cost of fencing it with barbed wire at the rate of Rs 20 per meter leaving a space 3m wide for a gate on one side. ​

Answer 1

Answer:

rs 4,940

Step-by-step explanation:

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Answer 2

Answer:

$\bold{here \: a \: = 120m}$

$\bold{b = 80m } \\ { \bold{ c = 50m}}$

$\bold{and \: s = \frac{a + b + c}{2} = \frac{250}{2} = 125 }$

Area she need to plant grass =

$\bold{ \sqrt{s(s - a)(s - b)(s - c)}}$

$\bold{ = \sqrt{125(125 - 120)(125 - 80)(125 - 50)}}$

$\bold{ = 375 \sqrt{15 {m}^{2} } }$

$\bold{cost \: of \: fencing = [(a + b + c) - 3] \times 20}$

$\bold{ \implies{rs.4940}}$

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