← etc / Encyclopedia of Triangle Centers

X₂₆₄₄¶

CROSSSUM OF PU(79)

X₂₆₄₄ (CROSSSUM OF PU(79)) constructed on acute reference triangle \((a, b, c) = (5, 6, 7)\) with unit baseline AB = \(1\).¶

"""GEOMETOR construction model for X_2644 = CROSSSUM OF PU(79)."""

        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,
            point_from_barycentrics,
            promote_point_to_top,
        )
        from geometor.etc.render import write_center_svg


        def construct_x_02644(
            model: Model, A: spg.Point, B: spg.Point, C: spg.Point
        ) -> spg.Point:
            """Construct X_2644 = CROSSSUM OF PU(79) on reference triangle ABC."""
            X_2644 = eval_trilinear_point(model, A, B, C, '1/((cot(A) - cot(B))*(cot(A) - cot(C))) - 1/(cot(B) - cot(C))**(2)', ID="X_2644", classes=["selected", "target"])
            X_661 = eval_trilinear_point(model, A, B, C, 'cot(B) - cot(C)', ID="X_661", classes=["center", "incident"])
            X_662 = eval_trilinear_point(model, A, B, C, '1/(cot(B) - cot(C))', ID="X_662", classes=["center", "incident"])
            central_line(model, X_661, X_662, 661, 662, incident=True)
            X_1931 = eval_trilinear_point(model, A, B, C, '(((b + c)**(2) - (a + b)*(a + c))/(b + c))', ID="X_1931", classes=["center", "incident"])
            X_2641 = eval_trilinear_point(model, A, B, C, '((a*(cot(B) - cot(A)) + b*(cot(C) - cot(B)) + c*(cot(A) - cot(C)))*(cot(C) - cot(A)) + (a*(cot(C) - cot(A)) + b*(cot(A) - cot(B)) + c*(cot(B) - cot(C)))*(cot(B) - cot(A)))', ID="X_2641", classes=["center", "incident"])
            central_line(model, X_1931, X_2641, 1931, 2641, incident=True)
            X_1776 = point_from_barycentrics(model, A, B, C, -0.74935401, 0.35658915, 1.3927649, ID="X_1776", classes=["center", "incident"])
            X_2651 = eval_trilinear_point(model, A, B, C, '(1/((cos(A) + cos(B))*(cos(A) + cos(C))) - 1/(cos(B) + cos(C))**(2))', ID="X_2651", classes=["center", "incident"])
            central_line(model, X_1776, X_2651, 1776, 2651, incident=True)
            return promote_point_to_top(model, X_2644)


        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_2644 on the given reference triangle."""
            model = create_model('X_2644 = CROSSSUM OF PU(79)')
            A, B, C = construct_baseline_triangle(model, *sides, show_guides=show_guides)
            construct_x_02644(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-02644.json"))
            write_center_svg(
                model_acute,
                here / "x-02644.svg",
                subtitle="(a, b, c) = (5, 6, 7) | AB = 1",
            )
        

X2644¶

X₂₆₄₄¶