



 
Hi Bill, The converse of the Pythagorean theorem says that if you have a triangle with side lengths a, b and c units and a^{2} + b^{2} = c^{2} then there is a right angle between the sides with lengths a and b. You have sides of length 18 feet and 11.5 feet and
Thus you need a distance of 21.36 feet which is 21 feet 4 ^{5}/_{16} inches. Penny  


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