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凹透鏡 Concave Lens
Author:
Alex CHIK
Drag the grey/ red points to change positions of the object. Drag the black point to change source of light.
GeoGebra
GeoGebra 互動數學教室
http://www.geogebra.hk
New Resources
Pyramids to Cube
Wallace-Simson Line, Orthopole, and Deltoid
Rings of circles
Transformation of curves
Thin Slice: Using Trig Ratios to Solve for Sides of Right Triangles
Discover Resources
Theorem of Pythagoras
Area of a Parallelogram
Pendulum Attempt 2
Locus
المحل الهندسي لمركز دائرة تمس مستقيمين
Discover Topics
Calculus
Differential Calculus
Circle
Geometric Mean
Division