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Hint: You might find Pythagoras' theorem very useful [a^{2} + b^{2} = c^{2}].
Answer: 148 inches.
We can use Pythagoras' theorem if we draw an imaginary line across to create a rightangled triangle.
The hypotenuse is equal to the rope's length R. The bottom of the triangle is 48 inches. The vertical side is R  8 (the difference between 20 inches and 12 inches).
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