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Go to the following link which will give you a better understanding of a rhombus.
Click on the following link: http://www.mathopenref.com/
Follow the following paths:
Plane Geometry > Quadrilaterals > Rhombus definition
Plane Geometry > Quadrilaterals > Area of a rhombus
Plane Geometry > Quadrilaterals > Perimeter of a rhombus
Follow the following paths:
Plane Geometry > Quadrilaterals > Rhombus definition
Plane Geometry > Quadrilaterals > Area of a rhombus
Plane Geometry > Quadrilaterals > Perimeter of a rhombus