On Mon, Sep 22, 2008 at 21:25, John Randall <[EMAIL PROTECTED]> wrote: > Roger Hui wrote: >> Sorry, pyramid. > > height/base=2.01214 ?
Seconded. If the base of the pyramid is a regular pentagon with unit outcircle radius, then the sides of these pentagon have length ]bs =: +: 1 o. o.%5 1.17557 which is also the length of the base of the sides of the pyramid. The heights of the sides of the pyramid have length deg =: o.%180 ]ht =: (2 o. o.%5) % (1 o. 20*deg) 2.36541 so the ratio indeed is ht%bs 2.01214 This also means those triangles got one 27.91 degree angle. Ambrus ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
