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 March 1st, 2017, 07:21 PM #1 Newbie   Joined: Mar 2017 From: United States Posts: 8 Thanks: 0 How to calculate the 'VALUE' of a point on a circle? The value of point A = 2 @ 0 degrees The value of point B = 6 @ 180 degrees How to calculate the value of point C = ? @ 120 degrees I have a computer program that returns point C = 4.57735 Can anyone PLEASE show me this math using calculator functions? Thank you so much for any help! March 2nd, 2017, 05:07 AM #2 Global Moderator   Joined: Oct 2008 From: London, Ontario, Canada - The Forest City Posts: 7,934 Thanks: 1128 Math Focus: Elementary mathematics and beyond You're going to have to offer a better explanation of what it is that you are trying to do, at least as far as I am concerned. Thanks from Frankenstein2 March 2nd, 2017, 05:56 AM #3 Senior Member   Joined: Apr 2014 From: Glasgow Posts: 2,155 Thanks: 731 Math Focus: Physics, mathematical modelling, numerical and computational solutions Yep... we need more information to give you anything meaningful. Thanks from Frankenstein2 March 2nd, 2017, 06:40 AM #4 Newbie   Joined: Feb 2017 From: Netherlands Posts: 8 Thanks: 2 Math Focus: Trigonometry and complex numbers Shouldn't it be $\displaystyle 4\frac{2}3$? Thanks from Frankenstein2 Last edited by Xxmarijnw; March 2nd, 2017 at 06:42 AM. March 2nd, 2017, 08:00 AM #5 Newbie   Joined: Mar 2017 From: United States Posts: 8 Thanks: 0 Thank you greg1313 and Benit13 for responding, CIRCLE values are: 0 degrees = 0 45 degrees = 1 90 degrees = 2 180 degrees = 4 360 degrees = 8 Sorry if I misrepresented the starting point value of 2 being at 0 degrees on the circle. What I meant was 0 degrees as my starting point which is @ 90 degrees on the circle TO 120 degrees as my ending point which is @ 210 degrees on the circle. Trying to understand why 120 degrees doesn't equal 8 / 3 + 2. Can anyone think of a formula as to how my computer program is calculating 4.57735 ? I can confirm that the generated value of 4.57735 is correct in my application. March 2nd, 2017, 08:30 AM #6 Senior Member   Joined: Apr 2014 From: Glasgow Posts: 2,155 Thanks: 731 Math Focus: Physics, mathematical modelling, numerical and computational solutions What is your program for? What is it trying to work out? Is CIRCLE a subroutine? If so, can you post the source code for that specific routine here? Thanks from Frankenstein2 March 2nd, 2017, 09:18 AM   #7
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Quote:
 CIRCLE values are: 0 degrees = 0 45 degrees = 1 90 degrees = 2 180 degrees = 4 360 degrees = 8
the relationship is linear ...

$v = \dfrac{\theta}{45}$ where $v$ is the "value" (whatever that means) and $\theta$ is the angle in degrees

so, $\dfrac{120}{45} = \dfrac{8}{3}$ March 2nd, 2017, 09:26 AM #8 Senior Member   Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,211 Thanks: 521 Math Focus: Calculus/ODEs It seems to me, from the data provided, that the "circle value" $\displaystyle C$ can be expressed as a function of the angle $\displaystyle \theta$ as follows: $\displaystyle C(\theta)=\frac{\theta}{45^{\circ}}$ And so, as you found: $\displaystyle C(210^{\circ})=\frac{210^{\circ}}{45^{\circ}}= \frac{14}{3}$ Thanks from Frankenstein2 March 2nd, 2017, 10:04 AM #9 Newbie   Joined: Mar 2017 From: United States Posts: 8 Thanks: 0 Sorry Benit13, I don't have the source code, but here are some other values generated from the software: 45 degrees from value 2 = 3.0 90 degrees from value 2 = 4.0 120 degrees from value 2 = 4.57735 180 degrees from value 2 = 6.0 240 degrees from value 2 = 7.42265 The 45, 90 and 180 degrees makes logical sense, but not the 120 and 240. 45 = 1 + 2 90 = 2 + 2 180 = 4 + 2 There has to be a formula for the 120 and 240 calculations that I'll probably never work out. Thank you everyone for your time and effort! March 2nd, 2017, 04:50 PM #10 Global Moderator   Joined: Dec 2006 Posts: 20,618 Thanks: 2072 Note that 4.57735... = 4 + 1/√3 and 7.42265... = 8 - 1/√3, and that tan(30°) = 1/√3. Thanks from Frankenstein2 Tags calculate, circle, point Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Similar Threads Thread Thread Starter Forum Replies Last Post sososasa Algebra 2 March 21st, 2014 03:08 PM sososasa Algebra 3 March 21st, 2014 09:15 AM arnoke Algebra 0 February 5th, 2013 05:57 AM clankill3r Calculus 10 March 15th, 2012 01:21 PM rich2020 Algebra 6 February 4th, 2012 04:57 PM

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