wheel
The German word for wheel is 'Rad'. It is a noun that is used in the same context as the English word 'wheel'. For example, 'The wheel of the car is broken' would be translated to 'Das Rad des Autos ist kaputt'.
The wheel is blue.
This sentence uses 'Rad' in the context of an object or a thing, referring to a 'wheel' which is 'blue' in color.
He rides a bike to work.
In this context, 'Rad' is used as a shortened form of 'Fahrrad', which translates to 'bicycle'. The phrase implies the individual's mode of transportation to work.
She repairs the wheel.
This sentence uses 'Rad' to imply a 'wheel' of any vehicle or device that needs repairing. The repairing task is being done by a female, as indicated by the pronoun 'Sie'.