If angle 3 is actue what is the other angles?

The question appears to relate to the angles of a triangle.

1) If angle 3 is acute then the other two angles can also be acute. In the case of an equilateral triangle all three angles are equal and acute.

2) If angle 3 is acute and one other angle is obtuse then the remaining angle is acute.

3) If angle 3 is acute and one other angle is a right angle then the remaining angle is acute.