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乘加挑戰題
Author:
spkwan
GeoGebra
New Resources
Nested spiral octagon
美國國旗 (Codex, 2026.10.06)
直角坐標平面上的旋轉變換
三半圓間的相切圓(Codex╱2026.10.07)
畫出對稱圖形
Discover Resources
相似三角形: 重溫
利用圓來畫橢圓
拋物線與圓的最短距離
正圆锥展开图
COVID-19 折線圖
Discover Topics
Normal Distribution
Orthocenter
Line Segment
Tangent Function
Interest Calculation