Symmetric net of triangular bipyramid, redrawn from Berman, Martin (1971). "Regular-faced convex polyhedra". Journal of the Franklin Institute. 291 (5): 329–352. doi:10.1016/0016-0032(71)90071-8.
This image of simple geometry is ineligible for
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Heptagon
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Symmetric net of triangular bipyramid, redrawn from Berman, Martin (1971). "Regular-faced convex polyhedra". Journal of the Franklin Institute. 291 (5): 329–352. doi:10.1016/0016-0032(71)90071-8.
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