What is missing

Question

Pythagorean theorem: A 20 ft long Wire is used to support an antenna the wire is connected to the Internet 15 foot above ground how far away from the base of the tower will the other end of the wire be located

Answer 1

You not only need help with math, but also you need help with grammar!  No punctuation, no capitalization!

 

Start by making a diagram or sketch.  I think what your problem suggests is that the wire and the antenna form a right triangle with hypotenuse of 20 and one leg of 15.  The other leg of that triangle (the base) is given by the Pythagorean Theorem: square of the base = 20² - 15² = 175.

The base = square root of 175 = 5√7 which I will leave to you to figure!