The triangle is a right angled triangle, because one angle of the triangle is a right angle, that is, it is exactly 90°.
Here, the measure of the two angles are given, so we can find the third angle using the angle sum property of a triangle
that is, 57° + 33° + x = 180°
= 90° + x = 180°
x = 180° - 90° = 90°
Since, the third angle is 90°, the triangle is a right angled triangle.
