Question

If two straight lines intersect each other, prove that the ray opposite to the bisector
of one of the angles thus formed bisects the vertically opposite angle​

Answer 1

Answer:

AB and CD are straight lines intersecting at O. OX the bisector of angles ∠AOC and OY is the OY is the bisector of ∠BOD. OY is the bisector of ∠BOD. ... ∴ The bisectors of pair of vertically opposite angles are on the same straight line.