Which latitude is represented by the equator?

The equator is defined as the major circle of latitude that is equidistant from the two poles and divides the Earth into the Northern and Southern Hemispheres. It is situated at 0 degrees latitude, serving as the baseline for measuring latitude in degrees both north and south. This means that any location along the equator is characterized by its latitude being zero.

The other options represent either longitude or measurements not associated with the equator. For example, 0 degrees longitude refers to the Prime Meridian, which is a vertical line running from the North Pole to the South Pole, while 180 degrees latitude does not exist as a measure of latitude, and 180 degrees longitude marks the antimeridian, which is the opposite side of the Prime Meridian. Thus, understanding that the equator's defining characteristic is its position at 0 degrees latitude is crucial.