Congruent triangles ΔQRS and ΔWXY with given angles and side lengths; find m∠W.
Two triangles, ΔQRS and ΔWXY, with given side lengths and angles. ΔQRS has angles 63° and 37°, and side QR = 50 mm. ΔWXY has angle 80° at X, side XY = 75 mm, and side YW = 83 mm. The triangles are congruent, and the task is to find the measure of angle W.