Are some parallelograms rhombuses?

AyatollahK

Yes. http://www.vias.org/comp_geometry/geom_quad_parallelogram.html "A parallelogram with equal sides (a = b) is called a rhombus." Mar 09 08, 10:07 AM

whee	All parallelograms are rhombuses! http://www.mathsisfun.com/quadrilaterals.html Mar 09 08, 10:07 AM

whee	All Rhombuses are parallelograms http://www.mathsisfun.com/quadrilaterals.html (Please delete my previous post, I mistyped!) Thanks! Mar 09 08, 10:09 AM

Baloo55th

Rhombus is the mathematician's name for the 'diamond' shape (as in the playing card suit). The square is a rhombus, too, being a special case where not only are all the sides equal but the angles are equal too. As the internal angles of any four-sided figure add up to 360 degrees, this means that the square has 4x90. Ordinary rhombuses have two equal 'narrow' angles and two equal 'wide' angles (i.e 2x40 and 2x140). Mar 09 08, 11:50 AM