Apply the Pythagorean theorem:
C^2 = a^2 + b^2
Where:
C = hypotenuse
A & b= the other two legs of the triangle:
Replacing:
c^2 = 12^2 + 4^2
Solve for c
c^2 = 144 + 16
c^2 = 160
c= √160
c= 12.65 inches
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