← etc / Encyclopedia of Triangle Centers

X₆₀₈¶

ISOGONAL CONJUGATE OF X₃₄₅

X₆₀₈ (ISOGONAL CONJUGATE OF X₃₄₅) constructed on acute reference triangle \((a, b, c) = (5, 6, 7)\) with unit baseline AB = \(1\).¶

"""GEOMETOR construction model for X_608 = ISOGONAL CONJUGATE OF X_345."""

        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,
            gergonne_point_of,
            isogonal_conjugate,
            promote_point_to_top,
            symmedian_point_of,
        )
        from geometor.etc.render import write_center_svg


        def construct_x_00608(
            model: Model, A: spg.Point, B: spg.Point, C: spg.Point
        ) -> spg.Point:
            """Construct X_608 = ISOGONAL CONJUGATE OF X_345 on reference triangle ABC."""
            X_345 = eval_trilinear_point(model, A, B, C, '(csc(A))/(1 - sec(A))', ID="X_345", classes=["center"])
            X_608 = isogonal_conjugate(model, A, B, C, X_345, ID="X_608", classes=["selected", "target"])
            X_6 = symmedian_point_of(model, A, B, C, ID="X_6", classes=["center", "incident"])
            X_19 = eval_trilinear_point(model, A, B, C, 'tan(A)', ID="X_19", classes=["center", "incident"])
            central_line(model, X_6, X_19, 6, 19, incident=True)
            X_7 = gergonne_point_of(model, A, B, C, ID="X_7", classes=["center", "incident"])
            X_27 = eval_trilinear_point(model, A, B, C, '(sec(A))/(b + c)', ID="X_27", classes=["center", "incident"])
            central_line(model, X_7, X_27, 7, 27, incident=True)
            X_25 = eval_trilinear_point(model, A, B, C, 'sin(A)*tan(A)', ID="X_25", classes=["center", "incident"])
            X_31 = eval_trilinear_point(model, A, B, C, 'a**(2)', ID="X_31", classes=["center", "incident"])
            central_line(model, X_25, X_31, 25, 31, incident=True)
            return promote_point_to_top(model, X_608)


        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_608 on the given reference triangle."""
            model = create_model('X_608 = ISOGONAL CONJUGATE OF X_345')
            A, B, C = construct_baseline_triangle(model, *sides, show_guides=show_guides)
            construct_x_00608(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-00608.json"))
            write_center_svg(
                model_acute,
                here / "x-00608.svg",
                subtitle="(a, b, c) = (5, 6, 7) | AB = 1",
            )
        

X608¶

X₆₀₈¶