External Angle of a Triangle

主題：角度

You can move the points of the triangle around, and you'll see that the measure of an exterior angle is always equal to the sum of the two opposite interior angles.

探索資源

Vectors in the CAS View Demo
SlantQuad
Visualizing volume by cross-section problems
Mathologer TimesTable
prop of rect 2

探索主題

黎曼和（Riemann Sum）
線性規劃或線性最佳化
坐標
反射
幾何分布

External Angle of a Triangle

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