If you travel all the way around the earth without touching the north or south
pole, then you travel through 360 degrees of longitude.
They're labeled (zero -- 180) east and (zero -- 180) west.
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+180 degrees.
An angle which is more than 180 degrees but less than 360 degrees is called a reflex angle.
An angle that measures more than 90 degrees and les than 180 degrees is an obtuse angle.
If they're less than 180 degrees, they're obtuse angles. If more than 180 degrees, they're reflex angles. (Exactly 180 degrees is a 'straight' angle.)
The greatest number of degrees anyone can be from the prime meridian is 180 degrees. This is because the prime meridian itself is located at 0 degrees longitude, and the maximum longitude value is 180 degrees both east and west. Therefore, any location can be a maximum of 180 degrees away from the prime meridian.