The triangular side walls of a flyover have been used for advertisements. The sides of the wails are 122 m, 22 m and 120 m (see figure). The advertisements yield earnings of Rs. 5000 per $${m}^2$$ per year. A company hired one of its walls for 3 months. How much rent did it pay?

Let a = 122 m, b = 22 m, c = 120 m
Also, we have,

$$b^2 + c^2 = (22)^2 + (120)^2 = 484 + 14400 = 14884 = (122)^2 = a^2$$

Thus, we observe that the side walls are in right triangular shape.

Thus, the area of the triangular side walls
= $$\frac{1}{2} × a × c$$
$$\Rightarrow$$= $$\frac{1}{2} × 22 × 120$$
$$\Rightarrow$$ = $$11 × 120 = 1320 m^2$$

We know that, yearly rent = Rs.5000 per $$m^2$$

Therefore, yearly rent
= Rs.5000 × $$\frac{1}{2}$$ per $$m^2$$

Now, the company has hired one of its walls for 3 months.

Thus, rent paid by the company for 3 months
= 1320 × $$\frac{5000}{12}$$ × 3
= 110 × 5000 × 3
= Rs. 1650000

Therefore, rent paid by the company for 3 months = Rs. 1650000.