Condition for a Quadrilateral to Be a Parallelogram

Rarely Tested

Condition for a Quadrilateral to Be a Parallelogram

## Formula

For vertices $$A,B,C,D$$:

$$\text{Midpoint of }AC=\text{Midpoint of }BD$$

## Usage

- Used to test whether the diagonals of a quadrilateral bisect each other.

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