nine-point circle

Questions

What does nine-point circle mean?

That circle which passes through the feet of the altitudes of a given triangle.

Where does nine-point circle come from?

So called because the circle passes through nine points of interest: the feet of the three altitudes, the centers of the three sides, and the midpoints of the segments which join the triangle's vertices with its orthocenter.

How to pronounce nine-point circle

1. Open the pronunciation page — Open the Speakur entry for “nine-point circle”.
2. Read the phonetic spelling — Read the IPA spelling () so you know which sounds to aim for.
3. Play the audio — Click Play to hear reference audio for “nine-point circle”.
4. Repeat and practice — Say “nine-point circle” aloud, matching stress and vowels until it feels natural.