Question

Q5 Why is the equator called The Great Circle??

Answer 1

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Any circle that circumnavigates the Earth and passes through the centre of the Earth is called a great circle. ... All the lines of longitude meet at the poles, intersecting the Earth in half. Thus a great circle always splits the Earth into two halves, so that the Equator is a great circle.      

Answer 2

Answer:

Every longitude along with its opposite longitude makes a complete circle around the earth and another complete big circle is the equator; while the latitudes make smaller circles along with the poles to be only points. So the equator and the longitudinal lines around the earth are called the Great Circles