document.write( "Question 217649: Use the fact that the earth is is 3960 miles and 1 mile is 5280 feet answer the following question.
\n" ); document.write( "A tower of a submarine is approximately 15 feet above sea level. How far can a person see from the top of the tower? \n" ); document.write( "

Algebra.Com's Answer #164075 by RAY100(1637) $\"\"$ $\"About$

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Radius of the Earth is approx 3960 mi
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\n" ); document.write( "If a tower is 15 ft above this, the distance is 15 ft /5280 ft/mi = .00284 mi,,,,,and the distance to the ctr of Earth is 3960 + .00284 mi
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\n" ); document.write( "If we construct a right triangle, one vertex at the top of the tower,
\n" ); document.write( "one at the center of the Earth, and another at the horizon point from the tower,,,,we find a right triangle, one leg 3960 mi, the hypotenuse = 3960.00284 mi, and the other leg the distance to the horizon. ( this leg is tan to curvature of Earth,,hence 90 degree angle)
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\n" ); document.write( "using the Pythagorean Theorem ,,c^2 = a^2 +b^2,
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\n" ); document.write( "(3960,00284)^2 = d^2 + 39606^2
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\n" ); document.write( "d= 4.7434 miles,,,,,,distance to horizon from tower.
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