# Q2.    The triangular side walls of a flyover have been used for advertisements. The sides of the walls are 122 m, 22 m and 120 m (see Fig. 12.9). The advertisements yield an earning of  Rs. 5000 per m2 per year. A company hired one of its walls for 3 months. How much rent did it pay?

From the figure,

The sides of the triangle are:

The semi perimeter, s will be

Therefore, the area of the triangular side wall will be calculated by the Heron's Formula,

Given the rent for 1 year (i.e., 12 months) per meter square is Rs. 5000.

Rent for 3 months per meter square will be:

Therefore,  for 3 months for 1320 m:

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