In triangle XYZ, XY<YZ and XZ<YZ. Which is the largest angle of triangle XYZ?

Answer 1

largest angle is opposite the largest side

largest side = YZ, X is the largest angle

Answer 2

Both XY and XZ are less than YZ, which make YZ the largest side of the triangle. The angle opposite the largest side is the largest angle. The angle opposite YZ is angle X, so angle X is the largest angle.