The Properties of a Rhombus
Definitions and formulas for the perimeter of a rhombus, the area of a rhombus, properties of the angles and sides of a rhombus
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perimeter of a rhombus  area of a rhombus  sides and angles of a rhombus 
properties of the diagonals of a rhombus 
properties of the angles of a rhombus 
The perimeter of a rhombus: 
To find the perimeter of a rhombus, just add up all the lengths of the sides: 
The area of a rhombus: 
To find the area of a rhombus, multiply the lengths of the two diagonals and divide by 2 (same as multiplying by 1/2): 
The sides and angles of a rhombus: 
The sides of a rhombus are all congruent (the same length.) Opposite angles of a rhombus are congruent (the same size and measure.) 
Properties of the diagonals of a rhombus:  
The intersection of the diagonals of a rhombus form 90 degree (right) angles. This means that they are perpendicular.
The diagonals of a rhombus bisect each other. This means that they cut each other in half. 

Properties of the angles of a rhombus:  
Adjacent sides (ones next to each other) of a rhombus are supplementary. This means that their measures add up to 180 degrees. 