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That's the formula we've seen for the area of a triangle in space.
这就是空间三角形的面积公式。
youdao
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Who knows how to calculate the area of a triangle, please raise your hand.
谁知道如何计算三角形的面积，请举手。
youdao
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Who knows how to calculate the area of a triangle, please raise your hand.
谁知道如何计算三角形的面积，请举手。
youdao