Geometric Model by A. Harry Wheeler, Polar Spherical Triangles

Wheeler, Albert Harry · 1920 04 06

This cut and folded tan paper model is one of several in which A. Harry Wheeler illustrated properties of polar spherical triangles. A sticker on it reads: PTb^*. One polar triangle is inside the other. The vertices of the outer triangle are labeled A, B, and C. The vertices of the inner triangle are labeled A₂, B₂, and C₂. The model has no Wheeler number. It also is marked: See STRIA(1)²