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| Summary |
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| A plane closed figure formed by four line segments is called a quadrilateral |
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| ABCD is a quadrilateral and written as quad. ABCD. |
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| Parallelogram |
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| A quadrilateral in which opposite sides are parallel is called a parallelogram. |
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| Rectangle |
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| A parallelogram each of whose angle is 900 and opposite sides are equal is called a rectangle. |
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| Square |
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| A rectangle having all sides equal is called a square. |
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| Rhombus |
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| A parallelogram having all sides equal is called a Rhombus. |
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| Trapezoid |
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| A quadrilateral in which two opposite are parallel and two opposite sides are non parallel is called a trapezoid. |
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| Kite |
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| A quadrilateral in which two pairs of adjacent sides are equal is known as kite. |
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- A diagonal of a parallelogram divides it into two congruent triangles.
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- In a parallelogram, the opposite sides are equal.
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- In a parallelogram, the opposite angles are equal
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- In a parallelogram, the diagonals bisect each other.
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- In a quadrilateral, if opposite sides are equal, it is a parallelogram.
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- In a quadrilateral, if opposite angles are equal, it is a parallelogram.
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- In a quadrilateral, if diagonals bisect each other, it is a parallelogram.
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