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Isogonal and Isotomic Conjugates

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Consider a triangle and a point . The three line segments , and (red, then green) extended to meet the opposite sides are known as the cevians of the triangle with respect to .

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The angle bisectors of are shown by red dashed lines.

The medians of are shown by green dashed lines.

The reflections of the cevians (red lines) about the angle bisectors intersect at a point called the isogonal conjugate.

The reflections of the cevians (green lines) about the medians intersect at a point called the isotomic conjugate.

You can drag the points , , and .

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Contributed by: Minh Trinh Xuan (August 2022)
Open content licensed under CC BY-NC-SA

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