8. The cost of fencing a triangular field at the rate of Rs. 5 per meter is Rs. 1920. If semi-perimeter is 48cm, find its area and all sides.
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Step-by-step explanation:
rate of Rs. 5
total cost Rs. 1920
cost = area × rate
area = cost/rate
area = 1920/5
area = 384cm²
semi-perimeter is 48cm
then perimeter = 2×48 = 96cm
a+b+c= 96
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