Question

If two straight lines intersect each other then prove that the ray opposite to the bisector of one of the angles so formed bisector the vertically opposite angle.​

Answer 1

Answer:

Proof : AB, CD and PQ are straight lines which intersect in O. Thus, the ray opposite to the bisector of one of the angles thus formed bisects the vertically opposite angle. Similarly, the bisector of ∠ AOD also bisects the ∠ BOC