diagonals
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Opposite angles
A quadrilateral has four vertices.
A quadrilateral need not have any vertical sides.
quad -- 4 sides - 4 vertices
A pentahedron can bea quadrilateral based pyramid which has 5 vertices, ora triangular prism which has 6 vertices.A pentahedron can bea quadrilateral based pyramid which has 5 vertices, ora triangular prism which has 6 vertices.A pentahedron can bea quadrilateral based pyramid which has 5 vertices, ora triangular prism which has 6 vertices.A pentahedron can bea quadrilateral based pyramid which has 5 vertices, ora triangular prism which has 6 vertices.