Why is the latitude of the North and South poles 90 degrees?

The unit of distance north or south of the Equator is known as latitude. It is determined using 180 imaginary lines running east-west, parallel to the Equator, across the Earth. Parallels are the names given to these lines. A circle of latitude is a hypothetical ring that connects all points that share a parallel. The axis of 0 degrees latitude is known as the Equator. With 90 degrees north of the Equator and 90 degrees south of the Equator, each parallel measures one degree north or south of the Equator. The North Pole is 90 degrees north latitude, and the South Pole is 90 degrees south latitude.

What was the length to begin with?

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