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任何三角形內角和180度(五上數翰４－２)
Author:
陳民峰
GeoGebra
New Resources
找出對稱軸
球体的体积推导（优化版）
画直线等分三角形的面积
【案例】2018年全国1卷理科12题
兩組對邊相等和有直角的四邊形
Discover Resources
for 學姊
半圓柱(可改底面圓半徑、柱高)
Example 2
直角坐標的旋轉變換
題6
Discover Topics
Parabola
Numbers
Geometric Mean
Root
Cylinder