Question

180° east/west longitude is called _____
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Answer 1

Answer:

The 180th meridian or antimeridian is the meridian 180° both east and west of the Prime Meridian, with which it forms a great circle dividing the earth into the Western and Eastern Hemispheres.

Explanation:

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Answer 2

Answer:

The 180th meridian or antimeridian is the meridian 180° both east and west of the Prime Meridian,

answer is meridian.