
rechteckig
rectangular
Having the shape of a rectangle; with four straight sides and four right angles.
Der neue Tisch hat eine große, rechteckige Platte aus Holz.
The new table has a large, rectangular wooden top.
rectangular
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rectangular
Having the shape of a rectangle; with four straight sides and four right angles.
Der neue Tisch hat eine große, rechteckige Platte aus Holz.
The new table has a large, rectangular wooden top.
The word is built from three parts: 'recht' (in the sense of 'rechter Winkel' (right angle), 90°), 'Eck' (corner), and the adjective ending '-ig'. So it literally describes something that has 'right corners.'
Ein Blatt Papier ist normalerweise rechteckig.
A sheet of paper is usually rectangular.
The adjective 'rechteckig' (rectangular) is derived directly from the noun 'das Rechteck' (rectangle). If you know the noun, you can easily work out the meaning of the adjective.
Zeichne bitte ein großes Rechteck auf das Papier.
Please draw a large rectangle on the paper.
'Rechteckig' (rectangular) is often used to describe the shape of everyday objects. Typical nouns are: 'ein rechteckiger Tisch' (a rectangular table), 'ein rechteckiges Fenster' (a rectangular window), 'ein rechteckiges Grundstück' (a rectangular plot of land), or 'ein rechteckiger Raum' (a rectangular room).
Unsere Küche ist lang und rechteckig.
Our kitchen is long and rectangular.
square / quadratic
Quadratisch describes a shape with four equal sides and four right angles. This shape also meets the definition of rechteckig; in everyday use, however, rechteckig usually refers to a shape with sides of different lengths. For a square, quadratisch is therefore more precise.

Die Tischplatte ist rechteckig und misst 120 mal 80 Zentimeter.
The tabletop is rectangular and measures 120 by 80 centimeters.
Die Tischplatte ist quadratisch und misst einen Meter auf jeder Seite.
The tabletop is square and measures one meter on each side.