Certainly! The term “公垂线” (gōng chuíxiàn) is a concept from geometry, particularly in the context of triangles and lines. It can be translated to “concurrent perpendiculars” or “height lines” in English. Let's break it down step by step:
### What is a "Perpendicular Line"?
1. **Definition**: A perpendicular line is a line that meets another line at a right angle (90 degrees).
2. **Example**: If you imagine a straight line


