Rhombus is a two-dimensional figure with equal sides. It is a special parallelogram with four congruent sides. All squares are rhombuses, but not all rhombuses are squares. Also known as diamond, lozenge, or rhomb
Parallelogram is a quadrilateral with parallel opposite sides and equal opposite angles. Opposite sides and angles are equal in length. Diagonals bisect each other. Sum of all angles is 360°, adjacent angles add up to 180°
Parallelogram is a quadrilateral with opposite sides parallel and equal. Opposite angles are equal and diagonals bisect each other. Same-side interior angles sum to 180°. Diagonals divide parallelogram into two congruent triangles
A quadrilateral is a closed shape with four sides, angles, and vertices. All quadrilaterals have two diagonals and the sum of interior angles is 360°. The order of vertices must be preserved when naming quadrilaterals
Rhombus is a special parallelogram with all four equal sides. Term 'rhombus' comes from Greek 'rhombos', meaning something that spins. Opposite angles are equal and opposite sides are parallel. Diagonals bisect each other at 90° and are equal in length
Square is a four-sided polygon with all sides equal and angles 90°. Opposite sides are parallel and diagonals bisect each other at 90°. Square can be defined as rectangle with equal opposite sides