Let's simplify this and find the length of the sides

adding 3 3 4 u get 10

so first side 20*3/10=6cm
second side 6cm
third side 8 cm

now with a ruler draw a 4cm base take 3cm length in your compass and cut an arc from both ends of your base

join the ends of the base to the point where both arcs intersect u will get it triangle

let me know if u could do it
please mark as brainliest if it helped