User talk:Leungcwd

Welcome!

Hello,, and welcome to Wikipedia! I hope you like the place and decide to stay.

There's a page about creating articles you may want to read called Your first article. If you are stuck, and looking for help, please come to the New contributors' help page, where experienced Wikipedians can answer any queries you have! Or, you can just type   on this page, and someone will show up shortly to answer your questions. Here are a few other good links for newcomers: I hope you enjoy editing here and being a Wikipedian! Please sign your name on talk pages using four tildes ( ~ ); this will automatically produce your name and the date. If you have any questions, check out Where to ask a question or ask me on. Again, welcome!--Mishae (talk) 13:51, 23 September 2013 (UTC)
 * Your first article
 * Biographies of living persons
 * How to write a great article
 * The five pillars of Wikipedia
 * Help pages
 * Tutorial

Archimedean spiral
I reverted the new section "Determining Pitch from Length and Turns" that you added to Archimedean spiral. The derivations of the formulas that you give in that section are not at all clear (for example, where does the constant 161.6386321668302 come from ?). If you want to add this material to the article, please provide a reference to a reliable source that shows how the formulas are derived. Gandalf61 (talk) 08:11, 2 October 2013 (UTC)


 * I have removed your new section again, because you added it back without providing a source. I also noticed that you changed the constant in your final expression from 161.6386321668302 to 42.51258829641819. This suggests that this section is based on your own calculations. Original work is not allowed in Wikipedia - see our policy on original research. As I said before, if you want to add this material to the article, you must provide a reliable source for it. Gandalf61 (talk) 08:53, 4 October 2013 (UTC)