Every cirlce has 360 degrees, regardless of size.
For this excercise, create a circle of a size of your choice.
Mark the points, 0 (zero) and 90 degrees.
How big is the circle if the distance between 89 degrres and 90 degrees is
What if that same distance were one mile?
Are you talking straight line distance, or distance along the arc? Distance
along the arc is easy, just 360 times the arc length of 12" or 1 mile.
Straight line distance is a little more complicated, but the same
calculation can be used to get a close approximation, realizing that the
actual value will be somewhat larger.
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