2.Next I'll draw a line from P down to B, and then from P down to C, and I claim that this triangle here is congruent to its reflection across that perpendicular bisector, which will be CPD.
接来,我将画一条 P 到 B,然后 P 到 C 的线, 我声称这里的这个三角形与其在垂直平分线上的反射全等,这就是 CPD。机翻