Ad: Icosahedron With Golden Rectangles (Geometry) T-Shirt
Like icosahedrons? Know about golden rectangles? Showcase the icosahedron, a regular polyhedron with 20 identical equilateral triangular faces, 30 edges and 12 vertices, with any of these geometry gifts. The icosahedron is one of five Platonic solids and includes golden rectangles (i.e., a rectangle whose side lengths are in the golden ratio, one-to-phi, or approximately 1:1.618). Mathematicians know that a distinctive feature of this shape is that when a square section is removed, the remainder is another golden rectangle -- one with the same proportions as the first. Educational geometric fun for all! myTees
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