Question:
The perimeter of a triangular field is 540 m and its sides are in the ratio 25: 17: 12. Find the area of triangle.
Solution:
Let the sides of the given triangle be a = 25x, b = 17x, c = 12x respectively,
So,
a = 25x cm
b = 17x cm
c = 12x cm
Given Perimeter = 540 cm
2s = a + b + c
a + b + c = 540 cm
25x + 17x + 12x = 540 cm
54x = 540 cm
x = 10 cm
Therefore, the sides of a triangle are
a = 250 cm
b = 170 cm
c = 120 cm
Now, Semi perimeter s = (a + b + c)/2
= 540/2
= 270 cm
By using Heron's Formula
The Area of the triangle $=\sqrt{s \times(s-a) \times(s-b) \times(s-c)}$
$=\sqrt{270 \times(270-250) \times(270-170) \times(270-120)}$
$=9000 \mathrm{~cm}^{2}$
Therefore, the area of the triangle is $9000 \mathrm{~cm}^{2}$