Question 659664
Creating the diagonal through the rectangle creates a right triangle.
Using pythagorean theorem, which says a^2 + b^2 = c^2, plug the following
a = 4m
b = 2m
c = ? the hypotenuse is the diagonal

4^2 + 2^2 = c^2
16 + 4 = c^2
20 = c^2
sqrt20 = sqrtc^2
4.47 miles = c