The perimeter of a triangle is 300 m. If its sides are in the ratio 3 : 5 : 7. Find the area of the triangle.
Sides of triangle are in ratio: 3 : 5 : 7
Since the perimeter of a triangle is given by:
Therefore sides of the triangle are:
When a, b and c are the sides of triangle and s is the semi-perimeter, then its area is given by:
A = 
where 
[Heron’s Formula]
= 
= 150
A = 
A = 
= 
m2
7