Geometry
# Quadrilaterals

**Note \(1\):** The above diagram is not drawn to scale, and \(\lvert \triangle ABC \rvert\) denotes the area of \(\triangle ABC.\)

**Note \(2\):** In the US a quadrilateral with one pair of parallel lines is called a "trapezoid." Elsewhere, a quadrilateral with one pair of parallel lines is called a "trapezium."

**Note:** In the US a quadrilateral with one pair of parallel lines is called a "trapezoid." Elsewhere, a quadrilateral with one pair of parallel lines is called a "trapezium."

**Note \(1\):** The above diagram is not drawn to scale, and \(\lvert{\triangle ABC}\rvert\) denotes the area of \(\triangle ABC.\)

**Note \(2\):** In the US a quadrilateral with one pair of parallel lines is called a "trapezoid." Elsewhere, a quadrilateral with one pair of parallel lines is called a "trapezium."

**Note \(1\):** The above diagram is not drawn to scale.

**Note \(2\):** In the US a quadrilateral with one pair of parallel lines is called a "trapezoid." Elsewhere, a quadrilateral with one pair of parallel lines is called a "trapezium."

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