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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.
In two dimensions 6 triangles meet at a vertex. In 3-dimensions any number of triangles (greater than 2) can meet at a vertext - a pyramid with the base in the shape of an n-gon will have n triangles meeting at its apex.
Tetrahedron 3 triangles meet at each vertex 4 Faces 4 Vertices 6 Edges Cube 3 squares meet at each vertex 6 Faces 8 Vertices 12 Edges Octahedron 4 triangles meet at each vertex 8 Faces 6 Vertices 12 Edges Dodecahedron 3 pentagons meet at each vertex 12 Faces 20 Vertices 30 Edges Icosahedron 5 triangles meet at each vertex 20 Faces 12 Vertices 30 Edges
Pyramids have a square base with four triangles sticking up that meet in the center. Therefore, a square with lines from corner to corner would represent the top view of a pyramid.
Triangles do not have parallel lines but as right angles triangles they do have perpendicular lines that meet at 90 degrees.