← etc / Encyclopedia of Triangle Centers

X₆₀¶

ISOGONAL CONJUGATE OF X₁₂

X₆₀ (ISOGONAL CONJUGATE OF X₁₂) constructed on acute reference triangle \((a, b, c) = (5, 6, 7)\) with unit baseline AB = \(1\).¶

"""GEOMETOR construction model for X_60 = ISOGONAL CONJUGATE OF X_12."""

        from __future__ import annotations

        from pathlib import Path

        import sympy.geometry as spg
        from geometor.model import Model

        from geometor.etc.ops import (
            central_line,
            construct_baseline_triangle,
            create_model,
            eval_trilinear_point,
            incenter_of,
            isogonal_conjugate,
            promote_point_to_top,
        )
        from geometor.etc.render import write_center_svg


        def construct_x_00060(
            model: Model, A: spg.Point, B: spg.Point, C: spg.Point
        ) -> spg.Point:
            """Construct X_60 = ISOGONAL CONJUGATE OF X_12 on reference triangle ABC."""
            X_12 = eval_trilinear_point(model, A, B, C, '1 + cos(B - C)', ID="X_12", classes=["center"])
            X_60 = isogonal_conjugate(model, A, B, C, X_12, ID="X_60", classes=["selected", "target"])
            X_36 = eval_trilinear_point(model, A, B, C, '1 - 2*cos(A)', ID="X_36", classes=["center", "incident"])
            X_58 = eval_trilinear_point(model, A, B, C, 'a/(b + c)', ID="X_58", classes=["center", "incident"])
            central_line(model, X_36, X_58, 36, 58, incident=True)
            X_28 = eval_trilinear_point(model, A, B, C, '(tan(A))/(b + c)', ID="X_28", classes=["center", "incident"])
            X_81 = eval_trilinear_point(model, A, B, C, '1/(b + c)', ID="X_81", classes=["center", "incident"])
            central_line(model, X_28, X_81, 28, 81, incident=True)
            X_1 = incenter_of(model, A, B, C, ID="X_1", classes=["center", "incident"])
            X_110 = eval_trilinear_point(model, A, B, C, 'csc(B - C)', ID="X_110", classes=["center", "incident"])
            central_line(model, X_1, X_110, 1, 110, incident=True)
            return promote_point_to_top(model, X_60)


        def build_model(
            sides: tuple[float, float, float] = (5.0, 6.0, 7.0),
            show_guides: bool = False,
        ) -> Model:
            """Build a `geometor.model.Model` for X_60 on the given reference triangle."""
            model = create_model('X_60 = ISOGONAL CONJUGATE OF X_12')
            A, B, C = construct_baseline_triangle(model, *sides, show_guides=show_guides)
            construct_x_00060(model, A, B, C)
            return model


        if __name__ == "__main__":
            here = Path(__file__).resolve().parent
            model_acute = build_model((5.0, 6.0, 7.0))
            model_acute.save(str(here / "x-00060.json"))
            write_center_svg(
                model_acute,
                here / "x-00060.svg",
                subtitle="(a, b, c) = (5, 6, 7) | AB = 1",
            )
        

X60¶

X₆₀¶