radius
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radius
In geometry, the line segment from the center of a circle or sphere to a point on the circumference or surface of the sphere. The radius is half the diameter.
Um den Kreis zu zeichnen, stelle den Zirkel auf einen Radius von 5 cm ein.
To draw the circle, set the compass to a radius of 5 cm.
radius
An area surrounding a certain point; the surrounding area.
Alle Supermärkte im Radius von zwei Kilometern waren bereits geschlossen.
All supermarkets within a radius of two kilometers were already closed.
You can tell from the context whether the geometric or the spatial meaning is intended. In mathematics and technology, it is about circles; in everyday language, it is about a distance around a point.
Der Radius des Vorderrads beträgt 30 cm.
The radius of the front wheel is 30 cm.
In geometry, the length of the radius is typically given with the preposition 'von' (of) and a unit of measurement.
Zeichnen Sie einen Kreis mit einem Radius von 3 cm.
Draw a circle with a radius of 3 cm.
To describe an area around a point, the fixed expression 'im Radius von' (within a radius of) followed by a distance is used very frequently.
Das Geschäft liefert im Radius von 15 Kilometern kostenlos.
The shop delivers free of charge within a radius of 15 kilometers.
range / reach
For a transmitter, Reichweite refers to the maximum distance its signal reaches. Radius, by contrast, describes an area extending a certain distance around a central point. Reichweite fits the performance of the signal, while Radius fits the spatial zone around the transmitter.
Das Signal ist in einem Radius von fünf Kilometern um den Sender verfügbar.
The signal is available within a radius of five kilometers around the transmitter.
Der neue Sender hat eine Reichweite von fünf Kilometern.
The new transmitter has a range of five kilometers.
