If triangle is cut out and removed, edges and are joined, and the figure is then creased along segments and, we obtain a triangular pyramid, all four of whose faces are isosceles triangles.
Kung ang tatsulok ay tanggalin at tinanggal na, ang mga gilid at ay sumali, at tayahin ang pagkatapos ay creased kasama segment at, Kumuha kami ng isang tatsulok na piramide, ang lahat ng apat na ang mukha ay isosceles triangles.