No, 40 mile radius is an area unit whereas 40 mile is distance. This means that something 30 miles from a location can be said to be in a 40 mile radius from that location.
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The formula for the area of a circle is: 3.14 (pi) times the radius squared. A circle with a 40 mile radius would have an area of 3.14 x 40 x 40 = 5024 square miles.
Exactly 40 miles. Changing from lower case to upper case does not alter the distance!
80 pi inches
There are 40 acres in 1/16th of a square mile 1 square mile = 640 acres
One mile (5,280 feet).