 Manipulative 1: Rhombus. Created with GeoGebra. 

A rhombus is a foursided
polygon
with opposite sides parallel and all sides the same length.
Properties of a Rhombus
 A rhombus is equilateral. All sides are the same length.
 Opposite sides of a rhombus are parallel.
 All rhombuses are polygons
 All rhombuses are quadrilaterals.
 All rhombuses are parallelograms.
 Squares are special cases of a rhombus whose sides meet at right angles.
 The opposite angles of a rhombus are congruent.
 The diagonals of a rhombus bisect each other.
 Each diagonal bisects the rhombus into two congruent triangles.
 The sums of the angles of a rhombus is 360° or 2π radians.
 A tesselation of a plane can be created using any rhombus.
 The area of a rhombus is A = bh where A is the area, b is the base and h is the height.
