http://en.wikipedia.org/wiki/Apothem English English Apothem - Wikipedia, the free encyclopedia equivalent of "r" apothem English apothem apothem English Apothem - Wikipedia, the free encyclopedia English Apothem - Wikipedia, the free encyclopedia English equivalent of "r" English English apothem English English Apothem apothem apothem Apothem - Wikipedia, the free encyclopedia English "apothem" or "inradius" English English English