Which of the following quadrilateral is not a parallelogram ?

Options

A. Rectangle
B. Square
C. Rhombus
D. None of these

Answer

To determine which of the following quadrilaterals is not a parallelogram, we need to analyze the properties of each shape listed: rectangle, square, rhombus, and none of these.

### Step-by-Step Solution:

1. **Define a Parallelogram**:
A parallelogram is a quadrilateral with two pairs of opposite sides that are parallel.

2. **Analyze Each Option**:
- **Rectangle**:
- A rectangle has opposite sides that are equal and parallel.
- Therefore, a rectangle is a parallelogram.
- **Square**:
- A square has all sides equal and opposite sides that are parallel.
- Therefore, a square is also a parallelogram.
- **Rhombus**:
- A rhombus has all sides equal and opposite sides that are parallel.
- Therefore, a rhombus is also a parallelogram.
- **None of These**:
- This option implies that all listed shapes are parallelograms.

3. **Conclusion**:
Since all the shapes listed (rectangle, square, and rhombus) are parallelograms, the correct answer to the question "Which of the following quadrilateral is not a parallelogram?" is **none of these**.

### Final Answer:
None of these (all options listed are parallelograms).

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