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A polygon has the same quantity of vertices as it has interior angles.
A rhombus normally has no right angles (at the vertices). If a rhombus has right angles (at the vertices), it is called a square. The diagonals of a rhombus meet at right angles.
A star is not a specific shape: it is a generic word for a shape which has an even number of vertices. The interior angles at alternate vertices are usually reflex angles. A star can have six or more vertices.
A rhombus is a 4 sided quadrilateral which has 4 vertices and 4 interior angles that add up to 360 degrees
A tetrahedron has four vertices.