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公弦
Author:
孟宝兴
三个相交圆，两两之间的公弦过一点。
GeoGebra
New Resources
找出對稱軸
四邉形 (四年級) 教師版
兩組對邊相等的四邊形
拼砌四邊形
sanjiaohanshu
Discover Resources
三角形的构成
五上_面積（二）
Chapter02
二年級_錐體的觀察
dingding_test
Discover Topics
Linear Equations
Curve Sketching
Triangles
Pyramid
Quadrilaterals