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angle between planes
Author:
johnmayhk
GeoGebra
New Resources
祖冲之的期望：内棋与外棋
兩位數除以一位數（二）
三位數除以一位數（二）
垂直線的斜率
直線的斜率
Discover Resources
圓周角
FHMS Corr Angles (Positions)
圓錐曲線截痕 to 定義式
angle sum of triangle
三角函數的繪圖1
Discover Topics
Quadrilaterals
Isosceles Triangles
Cosine
Solids or 3D Shapes
Integral Calculus