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Use the Pythagorean Theorem.
4sqrt(3)
In the formula, a and b are the legs and c is the hypotenuse of a right triangle. We are given a triangle with a=11, b=x, and c=13.
Substitute values
Calculate power
LHS-121=RHS-121
sqrt(LHS)=sqrt(RHS)
Split into factors
sqrt(a* b)=sqrt(a)*sqrt(b)
Calculate root