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 [DPRG] math I once knew Message index sorted by: [ date ] [ thread ] [ subject ] [ author ] Previous message: [DPRG] math I once knew Next message: [DPRG] Can Can Arm Subject: [DPRG] math I once knew From: Sluggy! slugmusk at linuxlegend.com Date: Fri Dec 20 16:59:00 CST 2002 ```I knew it would be pretty simple and infact, I'd tried the very solution as Kip presented it: radius * sin(angle) = Y radius * cos(angle) = X For my example, I used a radius of 3" and using Excel, I calculated the coordinates for each point along the clock face for the first 15 minutes. There is, however, a problem with the numbers. hour min radius deg X Y 12 0 3 0 3 0 1 3 6 2.88051086 -0.838246495 2 3 12 2.531561876 -1.609718754 3 3 18 1.980950125 -2.25296174 4 3 24 1.272537022 -2.716735086 1 5 3 30 0.46275435 -2.964094872 6 3 36 -0.383891069 -2.97533656 7 3 42 -1.199955945 -2.749564644 8 3 48 -1.920433018 -2.304763984 9 3 54 -2.487929499 -1.676367147 2 10 3 60 -2.857238941 -0.914431863 11 3 66 -2.998942368 -0.079653462 12 3 72 -2.901751765 0.761470088 13 3 78 -2.57340928 1.541935368 14 3 84 -2.040070487 2.19957096 3 15 3 90 -1.344220848 2.681989991 If you look at these, 0 degrees works out fine, corresponding to the 3 o'clock position as given. Then the points run clockwise from 3 o'clock all the way to about 11 o'clock. I would have expected 90 degrees to end up at 6 o'clock, with X = 0 and y = -3, but even the closest value (36 degrees) isn't exactly 6 o'clock. The formulae in Excel are X = radius * COS(deg) Y = radius * SIN(deg) with relative cell addresses rather than values, of course. Any ideas what I'm skipping? Sluggy! ``` Previous message: [DPRG] math I once knew Next message: [DPRG] Can Can Arm Message index sorted by: [ date ] [ thread ] [ subject ] [ author ] More information about the DPRG mailing list