Because of the circular nature of the polarcoordinate system, many curves can be described by a rather simple polarequation, whereas their Cartesian form is much more intricate. · We will derive formulas to convert between polar and Cartesian coordinate systems. We will also look at many of the standard polar graphs as well as circles and some equations of lines in terms of polarcoordinates. When plotting polarcoordinates and sketching polarequations, we will often use a polar grid. polar grid consists of a series of concentric circles of different radii and pre-sketched angles in standard position. Polar grid paper is available for free online if you wish to print and use it. but choose an angle coterminal to θ . Use the conversion formulas to convert equations between rectangular and polarcoordinates. Identify symmetry in polar curves, which can occur through the pole, the horizontal axis, or the vertical axis. Since there are a number of polarequations that cannot be expressed clearly in Cartesian form, and vice versa, we can use the same procedures we used to convert points between the coordinate systems. I find that drawing polargraphs is a combination of part memorizing and part knowing how to create polar t-charts. Below are tables of some of the more common polar graphs, including t -charts in both degrees and radians. In this section, we introduce to polarcoordinates, which are points labeled (𝑟, 𝜃) (r, θ) and plotted on a polar grid. The polar grid is represented as a series of concentric circles radiating out from the pole, or the origin of the coordinate plane. · 关键 takeaway： 当您想描述电池上固定的 “+” 或 “-” 极时，请使用 Positive Electrode 和 Negative Electrode。 当您想描述电极上正在发生的 反应过程 时（失电子还是得电子），请使用 …
