Using the definition for corner of the place at which two converging lines or surfaces meet.
There are 30 edges or corners to an icosahedron.
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Normally, a corner of a solid shape is understood to be a vertex - not an edge! An icosahedron has 12 vertices.
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An icosahedron has 12 vertices and 30 edges. It also has 20 faces.
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An icosahedron is a 20-sided figure. It also has 30 edges.
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A regular icosahedron has 20 faces (equilateral triangles), 30 edges and 12 vertices.