please give me e easy and short method
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Verified answer
The sides of the triangle is 122 m, 22 m and 120 m respectively.
Now, the perimeter will be (122+22+120) = 264 m
Also, the semi perimeter (s) = 264/2 = 132 m
Using Heron’s formula,
Area of the triangle =[ s(s-a)(s-b)(s-c)]
= 132(123-122)(132-120)(132-22)
=1320 m²
Rent of advertising per year = ₹ 5000 per m²
∴ The rent of one wall for 3 months = Rs. (1320×5000×3)/12
= Rs. 1650000