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I Why on Earth's surface, longitudinal or merediance lines are perpendicular to equatorial line?

  1. Apr 12, 2016 #1
    I think its a defination to have infinite longitudnal lines , if line are not perpendicular than the infinite point will not add up to give the circumferance of equator,
    please help
     
    Last edited: Apr 12, 2016
  2. jcsd
  3. Apr 12, 2016 #2

    Svein

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