Question

the sides of a triangle are in the ratio 3 ratio 4 ratio 5 is a perimeter of the triangle is 84 CM then find its side

Answer 1

let the sides be 3x,4x,5x
ATQ
$3x + 4x + 5x = 84 \\ 12x = 84 \\ x = 84 \div 12 \\ x = 7$
Hence,x=7
sides are
3x=21cm
4x=28cm
5x=35cm

Answer 2

Let the sides of triangle be 3x, 4x and 5x Given, Perimeter of triangle is 84cm Therefore, 3x+4x+5x=84 12x=84 x=7 Thus the 3 sides of triangle are 3×7=21cm 4×7=28cm 5×7=35cm