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Triangle Exterior Angle Theorem
Author:
William Richards
Move the vertices of the triangle to explore what happens to the angles.
GeoGebra
New Resources
從邊長辨認四邊形
判斷錐體
Transformaciones usando coordenadas
Intercepts in 3D
畫三角形
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Logic
Mode
Incircle or Inscribed Circle
Combinatorics
Calculus