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Property: If two lines intersect each other, then the vertically opposite angles are
                  equal.














                  AOD = BOC
                  COA = DOB



                  These are the two pairs of vertically opposite angles.

                  Theorem 6.1: If two lines intersect each other, then the vertically opposite
                  angles are equal.

















                  Given: ABandCDbetwolinesintersecting   each other at ‘O’.
                     (i)  AOC and  BOD (ii)  AODand  BOC are two pairs of vertically opposite
                  angles.
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