1 - From what is shown it is true that angles oposed by the vertex.
2 - From the image is not possible to conclude that because in order for that to happen the triangles OAB and OCD would have to be congruent, but we can not conclude that from the information given.
3 - it can be concluded from the image that the angles
4 - Two angles are complementary when their sum is 90, for this case, it can not be concluded because there is not enough information.
