三角學的平面應用 | Application of Trigonometry in 2D Problems

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希羅公式 | Heron’s Formula

三角學的平面應用 | Application of Trigonometry in 2D Problems 希羅公式 | Heron’s Formula

影片內容：

00:05 – 希羅公式及其證明 | Heron’s formula and its proof
06:59 – 例子 | example

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