Triangle XYZ is right-angled, so angle XYZ + angle XZY = 90&deg;.<br>Given angle XYZ = 4 times angle XZY, let angle XZY = 1 unit, angle XYZ = 4 units.<br>5 units = 90&deg;, so 1 unit = 18&deg;.<br>Angle XYZ = 4 times 18&deg; = 72&deg;.<br><br>Final Answer: 72&deg;