Question

the side of a triangle are in the ratio 3:4:5 and its perimeter is 84.find the lenght of its sides

Answer 1

If the ratio is 3:4:5 then let the sides be 3x,4x,5x.
Perimeter of a triangle =a+b+c
So,3x + 4x + 5x=84.
12x=84
So x=7

Now substitute for the sides.
3x=3*7=21
4x=4*7=28
5x=5*7=35

So the length of the sides are 21 cm,28cm and 35 cm.

Hope this helps u..................^_^

Answer 2

let the sides be 3x,4x and 5x


so, 3x+4x+5x = 84 cm
12x = 84 cm
x=84/12
x = 7cm
therefore, 3x = 21 cm
                4x = 28 cm
                 5x = 35 cm