Square | Parallelogram |
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A square is a quadrilateral | A parallelogram is also a quadrilateral |

Opposite sides of square are parallel to each other | Opposite sides of parallelogram are also parallel to each other |

Opposite angles of square are equal | Opposite angles of parallelogram are also equal | |

Adjacent angles of square are supplementary | Adjacent angles of parallelogram are also supplementary |

Diagonals of square bisect each other | Diagonals of parallelogram also bisect each other |

Diagonals of Square are of equal length | Diagonals of parallelogram are not of equal length |

Diagonals of Square are perpendicular bisector of each other | Diagonals of parallelogram are not perpendicular bisector of each other |

All angles of a Square are of 90 Degree each i.e. right angled at each vertex | Angles of parallelogram can be of different degree |

All sides of square are of equal length | Only opposite side of parallelogram are of equal length |