垂足三角形 (Chinese Wikipedia)

Analysis of information sources in references of the Wikipedia article "垂足三角形" in Chinese language version.

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2web.archive.org

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archive.org

Alfred S. Posamentier; Charles T. Salkind. Challenging problems in geometry. New York: Dover. 1996: 85-86. ISBN 9780486134864. OCLC 829151719.

web.archive.org

Trigonometry/Circles and Triangles/The Pedal Triangle - Wikibooks, open books for an open world. en.wikibooks.org. [2020-10-31]. （原始内容存档于2021-08-22）.
Weisstein, Eric W. (编). Antipedal Triangle. at MathWorld--A Wolfram Web Resource. Wolfram Research, Inc. [2021-08-22]. （原始内容存档于2021-08-22）（英语）.

wikibooks.org

en.wikibooks.org

Trigonometry/Circles and Triangles/The Pedal Triangle - Wikibooks, open books for an open world. en.wikibooks.org. [2020-10-31]. （原始内容存档于2021-08-22）.

wolfram.com

mathworld.wolfram.com

Weisstein, Eric W. (编). Antipedal Triangle. at MathWorld--A Wolfram Web Resource. Wolfram Research, Inc. [2021-08-22]. （原始内容存档于2021-08-22）（英语）.

worldcat.org

Alfred S. Posamentier; Charles T. Salkind. Challenging problems in geometry. New York: Dover. 1996: 85-86. ISBN 9780486134864. OCLC 829151719.