Question

construct a triangle whose angles
are in ratio 1:3:5 and length of sides included by first and last angles is 6cm.

Answer 1

add the angles and construct a triangle with a compass with radius measuring 6cm

Answer 2

let one side be=1x
and second side be=3x
and third side be=5x
so
1x+3x+5x=6cm
9x=6
x=6/9=2/3
so
first side =1*2/3=2/3 or 0.6666666________
second side=3*2/3=2
third side=5*2/3=10/3or3.333333________