Step 1: Draw PQ = 4 cm
Step 2: From Q take a radius of 3 cm and draw an arc. Also from P take a radius of 5.5 cm and draw an arc such that it intersects the arc drawn from Q. Mark the intersection as 'R'.
Step3: From Q take a radius of 4.8 cm and draw an arc. Also from R, take a radius of 5.9 cm and draw an arc such that it intersects the arc drawn from Q. Mark the point as 'S'.
Step 4: Join the points P,Q,R and S to get quadrilateral PQRS.
Step 5: Measure PS. It will be 1 cm.