Harmonic Conjugate Circles Relative to a Triangle Nikolaos Dergiades
Abstract. We use the term harmonic conjugate conics, for the conics C, C∗ with equations C : fx2 + gy2 + hz2 + 2pyz + 2qz + 2rxy = 0 and C∗ : fx2 + gy2 +hz2 −2pyz−2qz−2rxy = 0, in barycentric coordinates because ifA1, A2 are the points where C meets the sideline BC of the reference triangle ABC, then C∗ meets the same side at the points A′
1, A′ 2 that are harmonic conjugates
ofA1, A2 respectively relative to BC and similarly for the other sides ofABC [1]. So we investigate the interesting case where both C and C∗ are circles.
Harmonic Conjugate Circles Relative to a Triangle Nikolaos DergiadesAbstract. We use the term harmonic conjugate conics, for the conics C, C∗ with equations C : fx2 + gy2 + hz2 + 2pyz + 2qz + 2rxy = 0 and C∗ : fx2 + gy2 +hz2 −2pyz−2qz−2rxy = 0, in barycentric coordinates because ifA1, A2 are the points where C meets the sideline BC of the reference triangle ABC, then C∗ meets the same side at the points A′1, A′ 2 that are harmonic conjugatesofA1, A2 respectively relative to BC and similarly for the other sides ofABC [1]. So we investigate the interesting case where both C and C∗ are circles.
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