Question 767225
A right triangle is formed with 6 miles above the earth and 3,960 mile radius 
being the legs of the right triangle.  The distance to the horizon is the 
hypotenuse.


a² + b² = c² {the Pythagorean Theorem}
a and b are the legs, c is the hypotenuse


3960² + 6² = c² {substituted into the Pythagorean Theorem}
15,681,600 + 36 = c² {evaluated exponents}
15,681,636 = c² {added}
c ≈ 3,960.005 {took square root of each side and rounded}


The horizon is approximately 3,960 miles away
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