Tuesday, April 22, 2008
Construct a pentagon
This is where mathemagic gets tricky! This is not the only way to construct a pentagon, but I think it is pretty elegant.
I colorcoded the steps - do purple, then blue, then red. I've marked the centers of arcs with x's, and only drawn the arcs instead of the whole circle where I didn't need the whole thing.
This method uses pairs of arcs with equal radii to bisect angles and draw lines at right angles.
For a cool animation of this, check out the wikipedia page: