For the input angle 2 = 300, measured counterclockwise from the x axis, determine the two postures

For the input angle θ2 = 300◦, measured counterclockwise from the x axis, determine the two postures of link 4.

Figure P2.31 r2 = 60 mm, r3 = 140 mm, r4 = 140 mm, and r1 = 160 mm.