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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面積
最小公倍數與最大公因數
直角三角形
坐標
角錐

Internal angle sum of triangles

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