Prove that the length of any parallel of latitude is equal to the length of the equator times the cosine of the latitude angle.

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Assume as an approximation that the earth is a perfect sphere.

Call the radius of the sphere r.

Using the formula for the circumference of a circle, the length of the equator is `2pir`

Now, draw a triangle with a point at the centre of the earth A, a point on a particular latitude line B and a point horizontally across from that directly above the...

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