Let's start with a triangle in the plane Well, then we need two vectors to describe it say A and B here. How do we find the area of a triangle?
平面上有一个三角形,用两个向量描述,记作A、B，怎样求三角形的面积？
Anyway, I start my cut with a triangle file.
无论怎样，我开始用我的三角锉凹槽。
Anyway, I start my cut with a triangle file.
无论怎样，我开始用我的三角锉凹槽。
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