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angle in semi-circle
Author:
lamyc
GeoGebra
New Resources
四邉形 (四年級) 教師版
拼砌四邊形
算柱 (兩位數)
兩位數除以一位數（二）
四邊形的特性
Discover Resources
Name the prism 2
Twist Bottle
Indices 4
三角形三邊長
圓形移動面積
Discover Topics
Mode
Cosine
Trigonometry
Isosceles Triangles
Geometry