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 ...

Straight lines can be drawn in any direction. Horizontal lines go left and right. Vertical lines go up and down. Parallel lines are a fixed distance apart and will never meet, no matter how long they ...