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

The length of all latitudes is unequal to each other because:

1. The latitudes cover the circumference of earth from the equator to poles.

2. Since the circumference of the earth is already not equal at equator and poles, then it is not possible for the latitudes to be equal. They are only equidistant to each other.