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
For a discussion of polar triangles, see MA.304723.159.
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