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同心圓
Author:
何姵葶
GeoGebra
New Resources
拼砌四邊形
第八周作业
四邉形 (四年級) 教師版
三位數除以一位數（一）
画直线等分三角形的面积
Discover Resources
Catenoid
複合形體的表面積(凸形)
面、面相交
工具：DimensionArrows
congruent triangles_provided by Mr Yeung Kar Chun
Discover Topics
Isosceles Triangles
Coordinates
Line Segment
Circle
Ellipse