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动态轨迹（正三角形在正方形内滑动）
Author:
朱亮
GeoGebra
New Resources
Equation of Locus - Parabola
Circle Passing Through 3 Points
Shells
Reflection Across 2 Parallel Lines
Reflection = 180° Rotation about a Line
Discover Resources
SSA (Law of Sines Ambiguous Case Example)
Line Symmetry 2
CCSS High School: Geometry (Congruence) Volume 1 S N ATTAR
M Ware 2x2 Matrix Transformation
Discover Topics
Fractal Geometry
Congruence
Tangent Function
Random Variables
Quadrilaterals