Rhombus
In plane Euclidean geometry , a rhombus (plural rhombi or rhombuses ) is a quadrilateral whose four sides all have the same length. Another name is equilateral quadrilateral , since equilateral means that all of its sides are equal in length. The rhombus is often called a diamond , after the diamonds suit in playing cards which resembles the projection of an octahedral diamond , or a lozenge , though the former sometimes refers specifically to a rhombus with a 60° angle (which some authors call a calisson after the French sweet [1] – also see Polyiamond ), and the latter sometimes refers specifically to a rhombus with a 45° angle. Rhombus A rhombus in two different orientations Type quadrilateral , trapezoid , parallelogram , kite Edges and vertices 4 Schläfli symbol { } + { } {2 α } Coxet...