Illustration of the lower part of an icosahedron. The base consists of a regular pyramid, in which equilateral triangles are inserted to form the next section of the icosahedron, vintage line drawing or engraving illustration.

Illustration of the lower part of an icosahedron. The base consists of a regular pyramid, in which equilateral triangles are inserted to form the next section of the icosahedron, vintage line drawing or engraving illustration. - 132952823

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