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ธนธรณ์
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ธนธรณ์ เทียนทอง
GeoGebra
New Resources
Ellipse as Envelope - Correspondence Method
Napoleon's Theorem
van Aubel's Theorem
Ellipse, Hyperbola and Circle as Envelopes
Cross Product in 2D and 3D
Discover Resources
Translating Graph of Linear Functions
Reflection Lab
Transformations
lesson 5.5 properties of parallelograms
Problem-13
Discover Topics
Ratios
Solids or 3D Shapes
Tangent Line or Tangent
Similar Triangles
LCM and GCD