Tautology
A compound statement is said to be a tautology, if it is always true for all possible combinations of the truth values of its components. A tautology is also called a theorem or a logically valid statement patter..
To prove:
AD, BE and CF are concurrent (or pass through the same poin..
To prove:
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To prove:
AB||..
To prove: ..
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To prove:
If Q is any point on the perpendicular bisector of AB, AQ=B..
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