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Arizona, Colorado, utah, New Mexico
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. * * * * * Normally, a corner of a solid shape is understood to be a vertex - not an edge! An icosahedron has 12 vertices.
Knowing how to determine if an angle is a right triangle is important in architecture so that you can make sure that the corners of a building or opening are square. If your corners aren't square, your building will be crooked, and you will have trouble fitting windows and doors in place.
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