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### Topic: Angle Trisection Approximation (Read 1 time)previous topic - next topic

#### AlphaBeta

##### May 24, 2011, 07:05 am
Hello!

Trisecting an angle using compass and straightedge (well... almost anyways).

Care to review?

Thanks!

#1
##### May 24, 2011, 01:10 pm
That's pretty clever, but I know a better way.

Use compass to find straight edge, then use straight edge to hoke out calculator from behind the sofa where it fell the other day.

Then use the calculator

Woops, there's a bug in that algorithm, compass has been defined as type "direction_finding_device", it should be "circle_drawing_device".

______
Rob
Rob Gray aka the GRAYnomad www.robgray.com

#### liudr

#2
##### May 24, 2011, 04:21 pm
Nice work, very laborious. I'm drawing a blank in my head for angle/3. I haven't done hand drawings for ages. What software were you using?
Serial LCD keypad panel,phi_prompt user interface library,SDI-12 USB Adapter

#### AlphaBeta

#3
##### May 24, 2011, 04:29 pm
Thank you!

I used GeoGebra. It's really awesome for construction

Code: [Select]
`float trisect(float angle){  static const int COMPASS_AND_STRAIGHTEDGE = 3;  return angle / COMPASS_AND_STRAIGHTEDGE; //trisect using only compass and a straightedge}`

#### sciguy

#4
##### May 25, 2011, 03:30 am
In math class, we learned how to trisect an angle exactly (theoretically) on a piece of paper.  Requires folding the paper to make certain crease lines.
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