Horizontal lines run left to right, parallel to the horizon, with slope 0 and equation y = k. Vertical lines run top to bottom, perpendicular to the horizon, with undefined slope and equation x = k.

Perpendicular 和 vertical 这两个词经常出现在数学、物理课本里，它们都有“垂直的、成直角的”意思。它们之间的区别是什么呢？其实很简单，perpendicular 通常后面搭配介词 to，表示与某一物体构成直角。但这并不代表 perpendicular 就一定是“垂直竖立的”。Vertical ...

How to add vertical lines to a Word document using Office 365 Your email has been sent The article How to add horizontal lines to a Word 2016 document shows you two ways to add horizontal lines to a ...

Hello, I'm Mr Firth, and together we're going to learn about lines of symmetry. Symmetry is when one side of a shape looks exactly like the other—just flipped. Lots of buildings use symmetry because ...

Understanding keyboard combinations can help you compose better documents by opening up a series of symbols to use. For example, the vertical line character, represented as "|", allows you to break ...