Q20-A triangular park ABC has sides 42m, 34m and 20m A gardener
Kishore has to put fences 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 15 per metre leaving a space 4m wide for a
gate on one side.
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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
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
Hope it helps..☺
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