Select all designations of the sides of the angle.

Solution:

An angle is formed by two rays originating from a common vertex. In this diagram, the vertex is O. The two rays are OR and OT.

The sides of the angle can be represented by the rays in either order (e.g., OR or RO). Therefore, the possible designations for the sides of the angle are OR, RO, OT, and TO.

Answer: OR, RO, OT, TO