| 21. | Three of the area bisectors of a triangle are its medians, which connect the vertices to the opposite side midpoints.
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| 22. | Sixteen key points of a triangle are its internal angle bisectors, and its circumcenter, centroid, orthocenter, and incenter.
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| 23. | In a right triangle, the Euler line contains the perpendicular bisectors of sides, falls on the midpoint of the hypotenuse.
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| 24. | :: Or get the perpendicular bisectors of two of the lines joining the points, these will meet at the centre.
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| 25. | What I am not sure is whether in case n is odd the reflections are taken around the angle bisectors or not.
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| 26. | All area bisectors of a circle or other ellipse go through the center, and any chords through the center bisect the area.
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| 27. | The center is the point where the perpendicular bisectors intersect, and the radius is the length to any of the three vertices.
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| 28. | All area bisectors and perimeter bisectors of a circle or other ellipse go through the chords through the center bisect the area and perimeter.
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| 29. | All area bisectors and perimeter bisectors of a circle or other ellipse go through the chords through the center bisect the area and perimeter.
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| 30. | *If you have two smallest vectors with the same magnitude, then the mean vector will be on one of the angle bisectors.
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