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Since we have a given length and width, we can use these dimensions as legs of a triangle
Since we have a triangle with legs of 8 , 4 and a hypotenuse of x(our unknown side), we can use Pythagoreans theorem to find the unknown side.
Plug in a=8 and b=4 and lets solve for c
Square each individual term
Combine like terms
Take the square root of both sides
So our answer is
which reduces to