Question

Is the length of all lines of a latitudes equal or unequal to each other? Give reasons for your answer. What about the lines of longitudes?

Answer 1

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. The lines of latitude are not all equal in length. Since they are each complete circles that remain equidistant from each other, the lines of latitude vary in size from the longest at the equator to the smallest, which are just single points, at the North and South Poles.

Answer 2

three lines of longitudes which connect both the poles are equal because there aim or the place they connect are same. other that  these the other longitudes are also equal because the earth is round that's why the longitude will always be the same