Altitudes of Triangle Meet at Point
Let $\triangle ABC$ be a triangle.
Let $AJ$, $BG$ and $CH$ be the altitudes of $\triangle ABC$.
Thus, by definition, $AJ$, $BG$ and $CH$ are the perpendicular bisectors of $DF$, $DE$ and $EF$ respectively.
The result follows from Perpendicular Bisectors of Triangle Meet at Point.
- 2014: Christopher Clapham and James Nicholson: The Concise Oxford Dictionary of Mathematics (5th ed.) ... (previous) ... (next): Entry: altitude
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