Question

The sides of a triangle are in the ratio3:5:7:and it's perimeter 300m.Find its area

Answer 1

let it be 3x,5x,7x

perimeter of triangle=a+b+c

300=3x+5x+7x

300=15x

300÷15=x

x=20

3*20=60°

5*20=100°

7*20=140°