Content of type 'family'

GC-01 · Classical & Minimal-Step Compass Constructions

Euclid II.11, Lemoine–Hofstetter 5-step records, Mascheroni 5-circle compass-only, and rusty compass

GC-02 · Equilateral Triangles & Regular Hexagons

George Odom’s midline chord, reflected equilaterals, Bataille’s hybrid, and butterfly chords

GC-03 · Squares, Lattice Grids & Golden Crosses

Inscribed squares, 2×2 and 3×3 lattice grids, Suppa’s incircles, the Greek Cross, and rotated squares

GC-04 · Right Triangles, Egyptian 3–4–5 & Kepler Proportions

Huntley’s 3–4–5 bisector circle, Kepler’s geometric-progression right triangle, and Niemeyer’s linkage

GC-05 · Pentagons, Pentagrams, Affine Invariance & Stars

Ptolemy’s Almagest pentagon, Prasolov’s irregular equi-area pentagon, six-pentagon star, and Wu Xing

GC-06 · Circles, Apollonian Windows, Yin–Yang & Sangaku

Infinite rational secants, tangent equal circles, Kocik’s Golden Window, Yin–Yang, and Sangaku packings

GC-07 · Rhombi, Trapezoids, Mixtilinear Circles & Dissections

2:1 and golden rhombi, 1:3 area-bisecting trapezoids, mixtilinear circles, and Hooper–Curry resolution