In geometry, a quadrilateral is a figure of the plane. It always has four corners and four sides. Nevertheless, a quadrilateral can have different shapes, because the sides and angles can be of different sizes. The lines connecting the opposite corners of a quadrilateral are called diagonals.
If the sides or angles of a quadrilateral meet special conditions, then the quadrilaterals have certain names. There are trapezoids, parallelograms, rhombuses, dragon quadrilaterals, rectangles or squares. If none of this applies to a quadrilateral, then it is called an irregular quadrilateral.
In a trapezoid, two opposite sides run parallel and two can lie somehow, no matter how. If both pairs of sides are parallel, we speak of a parallelogram. If both pairs of sides are parallel to each other and also all sides are the same length, then the quadrilateral is called rhombus or rhombus.
If the diagonals are at right angles to each other, i.e. ninety degrees, one speaks of a dragon quadrilateral. If all corners of a quadrilateral are at right angles, this is called a rectangle. A rectangle with four sides of equal length is called a square.
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