Plane Geometry

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3 domain-specific abstractions whose origin domain is Plane Geometry.

• Cissoid — A plane curve constructed from two base curves and a pole by placing, on each ray through the pole, a point whose directed radius combines the two ray intersections.
• One-seventh area triangle — The inner triangle formed by three one-third cevians of a triangle, whose area is exactly one seventh of the original.
• Orthoptic (geometry) — The locus of points from which two tangents to a given curve meet at a right angle.