Question 366511
IN THE RIGHT TRIANGLE FIND THE LENGTH OF THE SIDE NOT GIVEN USE A CALCULATOR TO FIND AN APPROXIMATION TO THE DECIMAL PLACES. 
A=3 B=5 
THE VALUE OF C IS 
(ROUND TO NEAREST THOUSANDTH)
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You have to specify if the side is the longest, the hypotenuse, or if 5 is the hypotenuse.  Either way, use the Pythagorean Theorem, named for Pythagoras.
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If 5 is the long side:
{{{a^2 + s^2 = b^2}}}
{{{9 + s^2 = 25}}}
{{{s^2 = 16}}}
s = 4
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If the missing side is the hypotenuse:
{{{c^2 = a^2 + b^2}}}
{{{c^2 = 3^2 + 5^2}}}
{{{c^2 = 34}}}
c =~ 5.831
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It's not 17.  You can't make a triangle with sides of 3, 5 & 17.