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Z |
| Adams circle |
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| Ajima-Malfatti points |
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| altimedial triangles |
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| altitudes |
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| altitude feet |
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| anticevian triangle |
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| anticomplement |
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| antigonal points |
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| antimedial triangle |
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| anti-orthic axis |
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| antipedal line |
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| antipedal triangle |
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| Apollonian circles |
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| Apollonius point |
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| areal center |
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| Artzt parabolas |
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| autopolar triangle |
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