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橢圓
Author:
洪宜慧
GeoGebra
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球体的体积推导
畫出對稱圖形
球体的体积推导（优化版）
兩組對邊相等和有直角的四邊形
兩組對邊相等的四邊形
Discover Resources
proof50 劉邦佑
第三冊
动圆在定圆上滚动
雙曲線諸元
微信公众号“sx880A8”第253期摩纳哥亚国旗（flag of monaco）
Discover Topics
Angles
Constructions
Planes
Upper and Lower Sum or Riemann Sum
Kite