Theorem : Prove that vertically opposite angles formed by two intersecting lines are equal.
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Theorem : Prove that vertically opposite angles formed by two intersecting lines are equal.
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Step-by-step explanation:
You can refer above image
On line AB, linear pair
<AOD+<BOD=180°
IN LINE CD, Linear pair
<AOD+<AOC=180°
RHS 180° IS EQUAL AND THROUGH EQUATING
<AOD+<BOD=<AOD+<AOC
<AOD IS COMMON, SO ELIMINATE IT
<BOD=<AOC
Similarly, vice versa other opposite angle will be equal
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