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分數乘法2
Author:
Tong Wing Hong
GeoGebra
New Resources
找出對稱軸
三半圓間的相切圓(Codex╱2026.10.07)
Nested spiral octagon
Fibonacci Clock
幾何作圖題：切三圓（題目）
Discover Resources
面積切割
Orthocentre
sine graph (reduce to 1/2 and then translate leftward by 15 degree)
Angles in intersecting and parallel lines
伽利略比值II (Alfinio Flores & Hugh A. Sanders)
Discover Topics
Quadratic Functions
Geometry
Statistics
Calculus
Incircle or Inscribed Circle