Question

The sides of a traingle are in the ratio 13:14:15 and it perimeter is 84 cm find the area of the traingle

Answer 1

let sides be 13x , 14x and 15x

perimeter = sum of sides
84 = (13+14+15) x
84 = 42x
x =2

sides = 26 , 28 , 30

plz refer to attachment for area

Answer 2

Let the No. be x

13x+14x+15x=84

42x=84

=x=84/42


=x=2

1st ratio=13x=13×2=26

2nd ratio=14x=14×2=28

3rd ratio= 15x=15×2=30

Now,
s= a+b+c/2
=26+28+30/2
=84/2
= 42
s-a=42-26=16
s-b=42-28=14
s-c=42-30=12

Area= √s(s-a)(s-b)(s-c)
=√42×16×14×12
=√2×3×7×2×2×2×2×2×7×2×2×3
=2×2×2×2×3×7
= 16×21
=336 cm^2 ans.

MARK BRAINLIEST..