Well, usually when you purchase a tape measurment, it usually comes with the measurements on it. Any dummy would know the answer to this question...seriously.
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That would depend on how long your tape measure was.
The answer depends on the tape measure. It is quite likely it is 375 centimetres = 3.75 metres, but it is not possible to be sure.
You use a tape measure, or similar.
The answer depends on what the measurement units are. My guess is that they are 19.92 metres.
You find a tape measure and take the measurement across the door, then the length of it, then if necessary the thickness.