Question

which parallels are not circles

Answer 1

The Equator is another of the Earth's great circles. If you were to cut into the Earth right on its Equator, you'd.have two equal halves: the Northern
and Southern Hemispheres. The Equator is the only east-west line.that is a great circle. All.other parallels (lines of latitude) get smaller as you get near the poles

Answer 2

Square and rectangle have parallels but are not circles