Answer:
A. The Equator
Explanation:
a) equator
[incorrect] d ) prime meridian = line of longitude
[incorrect] b ) longitude does not help measure latitude
[correct] a ) equator because latitude is the measurement of distance north /south of the equator
[incorrect] c ) north pole is used, but the question specifically states should you <em>begin</em>...
There is no equations, sorry I can't help
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yes