S = ab*sin(alpha)
1) S = 2*3*sin(60) = 6*(√3/2) = 3√3
2) alpha = arcsin(S/ab)
alpha = arcsin(15/(5*6)) = arcsin(15/30) = arcsin(1/2) = 30°
3) b = S/(a*sin(alpha))
b = (14√2)/(4*sin(135°)) = (14√2)/(4*sin(90°+45°)) = (14√2)/(4*cos(45°)) = (14√2)/(4*(√2/2)) = (14√2)/(2√2) = 7
