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教材(试验本)(必修)第二册(上)关于点到直线的距离公式的证明是在引入直线的法向量的基础上,构造直角三角形利用向量的数量积的运算进行的。本文利用向量数量积的运算给出另外两种证法,供参考。证法一
Textbook (Test Book) (required) Volume 2 (above) The proof of the formula for the distance from the point to the straight line is based on the introduction of the normal vector of the straight line, and the construction of the right triangle is performed by the operation of the scalar product of the vector. This paper uses the calculation of the vector scalar product to give two other proofs for reference. Certificate One