Vertical angles have equal measure
The correct statement that proves that vertical angles are congruent is (d)
From the figure, we have the following observations
- Lines AB and CD intersect at point P
- Angles APC and CPB are adjacent (because they are next to each other)
- Angles CPB and DPB are adjacent (because they are next to each other)
The above highlights mean that:
[tex]\mathbf{APC +CPB =180}[/tex]
[tex]\mathbf{DPB +CPB =180}[/tex]
Equate the above expressions
[tex]\mathbf{DPB +CPB =APC + CPB}[/tex]
Subtract CPB from both sides
[tex]\mathbf{DPB=APC }[/tex]
Hence, the correct statement that proves that vertical angles are congruent is (d)
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