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The largest planar complete graph has four vertices.



Four is the maximum number of dimensions of a real associative division algebra (the quaternions), by a theorem of Ferdinand Georg Frobenius.A number is a multiple of 4 if its last two digits are a multiple of 4.For example, 1092 is a multiple of 4 because is the hyperoperation.) A four-sided plane figure is a quadrilateral (quadrangle) which include kites, rhombi, rectangles and squares, sometimes also called a tetragon.soft hearted cheerful person, like to smile n take things easy...