WE STILL HAVE TO FIND THE TWO UNKNOWNS FIRST. TO BE ABLE TO GET Z
x°+144°=180°(angles on a straight line)
x°=180°-144°
x=36°
y°+56°=180°(angles on a straight line)
y°=180°-56°
y=124°
z°+y°+x°=180°(sum of angles in a triangle)
z°+124°+36°=180°
z°=180°-124°-36°
z=20°