Why the length of a parallel increases as we move away from the poles towards the equator?

The length of a parallel increases as we move away from the poles toward the equator due to the Earth's curvature. The Earth is an oblate spheroid, meaning it is slightly flattened at the poles and bulges at the equator. As you move toward the equator, the circles of latitude (parallels) become larger because they encompass a greater circumference, resulting in longer lengths. This geometric property means that parallels are shortest at the poles and longest at the equator.