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Question

A triangular advertisement board has sides 11m, 15m and 6m. If the advertisement yields an earning of Rs1000/m2per month. In 3 and half years, the company will earn A2. Find the value of A ___.

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Solution

Using the Heron's formula, Area (A)= s(sa)(sb)(sc).
Semi-Perimeter (s) = a+b+c2 =11+15+62
=16 m
A=16(1611)(1615)(166) =202 m2
3 and a half years = 12 x 3 + 6 = 42 months.
earning in 3 and a half years =202×1000×42 =Rs.8400002
The value of A is 840000.

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