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

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

The area of a triangle is equal to half the product of any side and the altitude on that side.

三角形的面积等于任何一边与那边上的高的乘积的一半。

youdao

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