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代国兴
GeoGebra
New Resources
Simplifying Radicals: Geometric Thin Slice
"Compressed" Astroid as Envelope
Pelecoid
Stairs (Optical Illusion)
Ellipse as Envelope - Correspondence Method
Discover Resources
Activity 3-3
Midsegments of Triangles CT common core
HKDSE Sample Paper MC (B)
Scalar Multiplication Using Components
HOMEWORK
Discover Topics
Diagrams
Histogram
Rectangle
Normal Distribution
Sphere