**In figure— **

**Let PQRS be the Parallelogram.**

**PQ = RS & PR = QS (side length)****QS ≠ PR. ( diagonals are not equal)****PQ || RS and PS || QR.****∠SPQ = ∠QRS and ∠PQR = ∠RSP **

**Note : Parallelogram is a Rectangle if and only if all angles right angle.**

**Note : Diagonals are bisect to each other in all case.**

**To Prove :**

**Rectangle :**

** Opposite sides and diagonals are equal.**

**2. Square :**

** All sides and diagonals are equal.**

**3. Rhombus :**

** All sides are equal and diagonals are not equal.**

**4. Paralellogram : **

** Opposite sides are equal and diagonals are not equal.**