Question

why is the equator called the biggest circle?

Answer 1

Answer:

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. Great circles can be found on spheres as big as planets and as small as oranges. If you cut an orange exactly in half, the line you cut is the orange's great circle.

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Explanation:

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Answer 2

Answer:

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.