Prove that the bisector of a pair of vertically opposite angles are in the same straight line
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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.
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