Internal angle sum of triangles

作者：mrsK

- Drag the vertices A, B, C to create different types of triangles. - Use the sliders to create copies of the same triangle and prove that the internal angles always add up to 180 degrees.

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PowerOfAPoint
Proof Without Words
CCSS TP Algebra I 1.2.1 Example 3
Duongthang_Rotation_fixed3
Introduction to Gradient by Differentiation
GeogebraProject_TriangleW/Midpoints

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對數函數
算術運算
二次函數
3D 向量（三維）
角錐

Internal angle sum of triangles

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