← etc / Encyclopedia of Triangle Centers

X₃₇₈₈¶

X₃₀₅₃com[T(a², a² - b²)]

X₃₇₈₈ (X₃₀₅₃com[T(a², a² - b²)]) constructed on acute reference triangle \((a, b, c) = (5, 6, 7)\) with unit baseline AB = \(1\).¶

"""GEOMETOR construction model for X_3788 = X_3053com[T(a², a² - b²)]."""

        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,
            centroid_of,
            circumcenter_of,
            complement,
            construct_baseline_triangle,
            create_model,
            eval_barycentric_point,
            eval_trilinear_point,
            promote_point_to_top,
        )
        from geometor.etc.render import write_center_svg


        def construct_x_03788(
            model: Model, A: spg.Point, B: spg.Point, C: spg.Point
        ) -> spg.Point:
            """Construct X_3788 = X_3053com[T(a², a² - b²)] on reference triangle ABC."""
            X_3767 = eval_barycentric_point(model, A, B, C, 'a**(4) + (b**(2) - c**(2))**(2)', ID="X_3767", classes=["center"])
            X_3788 = complement(model, A, B, C, X_3767, ID="X_3788", classes=["selected", "target"])
            X_2 = centroid_of(model, A, B, C, ID="X_2", classes=["center", "incident"])
            X_39 = eval_trilinear_point(model, A, B, C, 'a*(b**(2) + c**(2))', ID="X_39", classes=["center", "incident"])
            central_line(model, X_2, X_39, 2, 39, incident=True)
            X_3 = circumcenter_of(model, A, B, C, ID="X_3", classes=["center", "incident"])
            X_114 = eval_trilinear_point(model, A, B, C, 'b*c*(b*sec(B +  omega  ) + c*sec(C +  omega  ))', ID="X_114", classes=["center", "incident"])
            central_line(model, X_3, X_114, 3, 114, incident=True)
            X_140 = eval_trilinear_point(model, A, B, C, '2*cos(A) + cos(B - C)', ID="X_140", classes=["center", "incident"])
            X_141 = eval_trilinear_point(model, A, B, C, 'b*c*(b**(2) + c**(2))', ID="X_141", classes=["center", "incident"])
            central_line(model, X_140, X_141, 140, 141, incident=True)
            return promote_point_to_top(model, X_3788)


        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_3788 on the given reference triangle."""
            model = create_model('X_3788 = X_3053com[T(a², a² - b²)]')
            A, B, C = construct_baseline_triangle(model, *sides, show_guides=show_guides)
            construct_x_03788(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-03788.json"))
            write_center_svg(
                model_acute,
                here / "x-03788.svg",
                subtitle="(a, b, c) = (5, 6, 7) | AB = 1",
            )
        

X3788¶

X₃₇₈₈¶