Final answer:
The triangle with angles of 50, 120, and 10 degrees is a scalene triangle because all angles are different and none of them is 90 degrees.
Step-by-step explanation:
The student's question is about classifying a triangle with given angles of 50, 120, and 10 degrees. Based on the definition of different types of triangles, we can deduce which category this triangle belongs to. A scalene triangle has all sides of different lengths, and accordingly, its angles are all different as well. An equilateral triangle has all three angles equal to 60 degrees. An isosceles triangle has at least two equal angles. A right-angled triangle has one 90-degree angle. Since the given angles are all different and none of them is 90 degrees, the triangle is a scalene triangle.