← etc / Encyclopedia of Triangle Centers

X₃₄₇₈¶

ISOGONAL CONJUGATE OF X₃₄₇₆

X₃₄₇₈ is the isogonal conjugate of X₃₄₇₆.

X₃₄₇₈ (ISOGONAL CONJUGATE OF X₃₄₇₆) constructed on acute reference triangle \((a, b, c) = (5, 6, 7)\) with unit baseline AB = \(1\).¶

"""GEOMETOR construction model for X_3478 = ISOGONAL CONJUGATE OF X_3476."""

        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,
            circumcenter_of,
            construct_baseline_triangle,
            create_model,
            eval_trilinear_point,
            incenter_of,
            isogonal_conjugate,
            point_from_barycentrics,
            promote_point_to_top,
        )
        from geometor.etc.render import write_center_svg


        def construct_x_03478(
            model: Model, A: spg.Point, B: spg.Point, C: spg.Point
        ) -> spg.Point:
            """Construct X_3478 = ISOGONAL CONJUGATE OF X_3476 on reference triangle ABC."""
            X_3476 = eval_trilinear_point(model, A, B, C, '(2 - cos(A) - cos(B) - cos(C) + cos(B)*cos(C))', ID="X_3476", classes=["center"])
            X_3478 = isogonal_conjugate(model, A, B, C, X_3476, ID="X_3478", classes=["selected", "target"])
            X_3 = circumcenter_of(model, A, B, C, ID="X_3", classes=["center", "incident"])
            X_902 = eval_trilinear_point(model, A, B, C, 'a*(b + c - 2*a)', ID="X_902", classes=["center", "incident"])
            central_line(model, X_3, X_902, 3, 902, incident=True)
            X_77 = eval_trilinear_point(model, A, B, C, '1/(1 + sec(A))', ID="X_77", classes=["center", "incident"])
            X_1122 = eval_trilinear_point(model, A, B, C, '((a*(b + c) + (b - c)**(2))/(b + c - a))', ID="X_1122", classes=["center", "incident"])
            central_line(model, X_77, X_1122, 77, 1122, incident=True)
            X_1 = incenter_of(model, A, B, C, ID="X_1", classes=["center", "incident"])
            X_1828 = point_from_barycentrics(model, A, B, C, 0.087301587, 0.19047619, 0.72222222, ID="X_1828", classes=["center", "incident"])
            central_line(model, X_1, X_1828, 1, 1828, incident=True)
            return promote_point_to_top(model, X_3478)


        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_3478 on the given reference triangle."""
            model = create_model('X_3478 = ISOGONAL CONJUGATE OF X_3476')
            A, B, C = construct_baseline_triangle(model, *sides, show_guides=show_guides)
            construct_x_03478(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-03478.json"))
            write_center_svg(
                model_acute,
                here / "x-03478.svg",
                subtitle="(a, b, c) = (5, 6, 7) | AB = 1",
            )
        

X3478¶

X₃₄₇₈¶