AB = 5cm, ∠B = 45° and BC = 6cm.

Step -1:
Draw a rough sketch of a triangle and label it with the given measurements.
Step -2:
Draw a line segment AB of length 5cm.
Step -3:
Draw a ray \(\overrightarrow {BY}\) making an angle 45° with AB.
Step -4:
Draw an arc of radius 6 cm from B, which cuts \(\overrightarrow {BY}\) at C.
Step -5:
Join A, B to get the required ΔABC.