Fixes applied (§1-§7 buildP1-buildP7 only):
§1.1 (Fix 11): Pentagon viewBox 170→185; C/D vertex labels at y=176 and
side label 'c' at y=174 were clipped — now visible.
§1.3 (Fix 1): Hexagon — added 3 missing diagonals (only 6 of 9 drawn);
expanded viewBox 160→175; caption moved from y=170 (clipped) to y=171.
§1.5 (Fix 2): Octagon — stray vertex circle and diagonal endpoints at
(140,16) replaced with actual 8th vertex (74,26); corrected two diagonal
endpoints accordingly.
§2.1 (Fix 12): Pentagon triangulation viewBox 165→178; A₃/A₄ vertex
labels at y=166 clipped → moved to y=172; caption moved y=156→y=174.
§2.2 (Fix 9): Equilateral triangle was isosceles (sides ~70,66,70);
replaced points to make all sides ≈62.4.
§2.3 (Fix 3): Nonagon viewBox 160→185; bottom vertices at y=170 were
clipped; caption moved to y=180.
§3.1 (Fix 10): Fixed misleading comment ("beyond A" → "beyond B").
§3.2 (Fix 4): Hexagon external angle extension line and arc were outside
viewBox width=280; redesigned to extend upward within bounds; viewBox
height expanded to 172.
§4.2 (Fix 5): Parallelogram angle arcs — C and D arcs were completely
swapped (drawn at each other's vertices); recalculated all arc endpoints
from unit vectors along polygon sides.
§4.3 (Fix 6): Side labels 8 and 5 swapped on example parallelogram
(AB=CD=8, BC=DA=5); corrected positions.
§4.3 (Fix 7): Angle arcs at A and C misplaced; recalculated endpoints
to correctly span each corner angle.
§6.1 (Fix 8): Признак 2 SVG used undefined marker #arr causing invisible
arrows; replaced with inline tick + polyline chevron marks.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Maxim Dolgolyov
641d62ac5f