Do you think you can't hold to math? No Way! Intresting and fun!
What do you think that 20walled sape is made-up?
It's hard to imagine.
Just make a board like this
Then fold. You would learn this in Gitan Gabe.
You see, if a pyramid has a triangel floor, it is not a pyramid. It's a 4 walled shape!
![[Level:0]](http://www.jalbum.com/xe/modules/point/icons/default/0.gif "Point:point (0%), Level:0/30"){kind=icon}
Joon