How is a rhombus defined?

A rhombus is defined as a parallelogram with four congruent sides. This means that all sides of a rhombus are of equal length, which distinguishes it from other types of parallelograms that may have sides of different lengths. While a rhombus does fall under the category of parallelograms, its specific property of having all congruent sides is what defines it uniquely among parallelograms.

In addition, a rhombus has other characteristics such as opposite angles being equal and adjacent angles being supplementary, which are properties of all parallelograms. These properties stem from the fact that a rhombus is a special type of parallelogram where the additional condition of having equal side lengths is satisfied. Understanding this definition is crucial in geometry as it helps in recognizing and working with different shapes and their attributes effectively.