Which of the following statement is INCORRECT?

Options

A. Diagonals divide the parallelogram into two congruent triangles.
B. Every square is a rhombus.
C. All parallelograms are trapeziums.
D. All rectangles are squares.

Answer

To determine which of the following statements is incorrect, we will analyze each option step by step.

### Step-by-Step Solution:

1. **Option 1: Diagonals divide the parallelogram into two congruent triangles.**
- In a parallelogram, when you draw a diagonal, it divides the shape into two triangles.
- These triangles are congruent because they share a side (the diagonal) and have equal opposite sides.
- Therefore, this statement is **true**.

2. **Option 2: Every square is a rhombus.**
- A square has all sides equal and opposite sides parallel, which satisfies the properties of a rhombus.
- Thus, every square indeed is a rhombus. This statement is also **true**.

3. **Option 3: All parallelograms are trapeziums.**
- A trapezium (or trapezoid) is defined as a quadrilateral with at least one pair of parallel sides.
- Since a parallelogram has two pairs of parallel sides, it fits the definition of a trapezium.
- Therefore, this statement is **true**.

4. **Option 4: All rectangles are squares.**
- A rectangle has opposite sides equal and all angles equal to 90 degrees, but it does not require all four sides to be equal.
- A square is a specific type of rectangle where all sides are equal.
- Therefore, not all rectangles are squares, making this statement **false**.

### Conclusion:
The incorrect statement is **Option 4: All rectangles are squares**.