Question

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Answer 1

4:Longitudes are known as meridians because in Geographical sense, meridians are great circles which are not parallel to each other but intersect each other at the North and the South Poles.

5: No, they are not. Only the lines of longitude are of equal length. Each line of longitude equals half of the circumference of the Earth because each extends from the North Pole to the South Pole.

6: The Equator and all diametrically opposite longitudes are called Great circles. Because they pass through or touch the centre of the circle.