F(n) = 2f(n-1) +2
2 answers:
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The square's diagonal is the triangle's hypotenuse.
the original Pythagorean theorem is
where a and b are the two sides and c is the hypotenuse.
that means the Pythagorean theorem for this question is:
or 
the original Pythagorean theorem is
that means the Pythagorean theorem for this question is: