To become proficient in geometry, students must learn about a variety of lines and angles. One important concept is understanding parallel, perpendicular, and intersecting lines. These lines are basic ...

Higher - The gradients of two perpendicular lines will always multiply to make –1. Make sure you are familiar with finding the equation of a line and calculating gradient to understand equations of ...

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.

An introduction to one of the most amazing ideas/numbers in mathematics Watch the next lesson: https://www.khanacademy.org/math/geometry/parallel-and-perpendicular ...