Question

The ratio of the sides of a triangle are 3 4 5 and perimeter is510

Answer 1

3+4+5=12
3/12x510= 127.5
4/12x510= 170
5/12x510= 212.5

Answer 2

we know that
perimeter of triangle= sum of all side
let, the number be 3x,4x,5x
according to question
3x+4x+5x=510
12x=510
x=510/12
x=42.5
Angles are
3x=3*42.5 =127.5
4x=4*42.5=170
5x=5*42.5=212.5
.... I hope it will help you