| 1. | We can infer the proof from existence of isogonal conjugate too.
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| 2. | The isogonal conjugate of the circumcircle is the line at infinity.
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| 3. | They are the duals of the isogonal Archimedean solids, noble.
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| 4. | It has 20 faces, each being simple concave isogonal hexagons.
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| 5. | It is the isogonal conjugate of the nine-point center.
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| 6. | The perpendicular bisector construction can be reversed via isogonal conjugation.
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| 7. | Other isogonal skew aperigons have alternate edges parallel to the frieze direction.
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| 8. | All three of these tilings are isogonal and monohedral.
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| 9. | The isogonal conjugate of the incentre " I " is itself.
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| 10. | The Brocard points are isogonal conjugates of each other.
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