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InvisibleMr.GuessWork
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Re: Simple geometry question [Re: Mr.GuessWork] * 1
    #21959762 - 07/18/15 09:24 AM (8 years, 6 months ago)

http://www.mathopenref.com/constdividesegment.html

Here's a step by step thing that shows how to get an arbitrary number of division of a line. That last fuckup still hurts.


Edited by Mr.GuessWork (07/18/15 09:24 AM)


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Invisiblepsi
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Re: Simple geometry question [Re: koods]
    #21959765 - 07/18/15 09:25 AM (8 years, 6 months ago)

Quote:

koods said:
A math class wants you to use an imprecise device to accomplish this?



From what I understand, geometry proofs can often involve demonstrating how one might construct something with a compass and straightedge. I'm pretty clueless in this area though. At first I thought OP was trolling us with some impossible task, but it turned out I was thinking of trisecting an angle. Apparently it's been proven that it's impossible to trisect an arbitrary angle with a compass and straightedge.


This vid apparently shows how to trisect a line segment. If you knew how to construct a square around the circle (and the video is legit) then you could do this on the top and bottom of the square and then connect them. Like I say though I barely know the first thing about this stuff.


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InvisibleMr.GuessWork
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Re: Simple geometry question [Re: psi]
    #21959780 - 07/18/15 09:30 AM (8 years, 6 months ago)

Quote:

psi said:
Quote:

koods said:
A math class wants you to use an imprecise device to accomplish this?



From what I understand, geometry proofs can often involve demonstrating how one might construct something with a compass and straightedge. I'm pretty clueless in this area though. At first I thought OP was trolling us with some impossible task, but it turned out I was thinking of trisecting an angle. Apparently it's been proven that it's impossible to trisect an arbitrary angle with a compass and straightedge.


This vid apparently shows how to trisect a line segment. If you knew how to construct a square around the circle (and the video is legit) then you could do this on the top and bottom of the square and then connect them. Like I say though I barely know the first thing about this stuff.





I thought he was trolling us at first too, then I realized that I'd never used a compass for anything in geometry, and my entire education on compasses was basically somebody mentioning that trisecting an angle and the squaring of a circle were impossible. I guess it's not a hot topic in most geometry classes. They tend to focus on pre-trig stuff I think.


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Invisiblepsi
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Re: Simple geometry question [Re: Mr.GuessWork]
    #21959802 - 07/18/15 09:42 AM (8 years, 6 months ago)

Yeah I took a high school geometry class that covered vectors and projections and so on but nothing on this classical geometry stuff. My sister's boyfriend does math tutoring and he was showing me this iPad app for learning to do these construction style proofs.

I need a bunch of math for the degree I'm working on (computer science) but I've mostly been avoiding the math classes I need. I used to be pretty good in math in high school but I kind of lost my touch after a decade out of school. It's getting to the point where I have to do the math and stats stuff to get into the CS courses I want to take though.


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Offlinestarfire_xes
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Re: Simple geometry question [Re: psi]
    #21959803 - 07/18/15 09:42 AM (8 years, 6 months ago)

You can either algebraically find the angle of rotation from the center as i said earlier, or draw arcs with the compass that pass through the midpoint of a radial line drawn to the center and the edge of the circle to find the points.

Connecting algebra to the geometry is called analytic geometry.  But I guess this was supposed to be a compass proof?


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Edited by starfire_xes (07/18/15 09:47 AM)


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InvisiblePrisoner#1
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Re: Simple geometry question [Re: koods] * 1
    #21959811 - 07/18/15 09:45 AM (8 years, 6 months ago)

Quote:

koods said:
Ah wait. Divide the circle into half horizontally. Ok draw two circles with the focus being the outsides of the circle where the bottom half meets the top half. The circles have a diameter of 1/3 the full circle. Draw two parallel lines from the tops of the circles and the bottoms.







did you just draw a picture of a bug and tell him that's the solution


epic work man!


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