Asked by Muna

Find the parallel of latitude along a journey of 166 km makes a change of 4 degrees in longitude .
Answered by oobleck
The earth's radius is 6378 km
at a latitude of θ, the radius is 6378 cosθ
So, you want
6378 cosθ * 4/360 * 2π = 166
θ = 68.1°