What is the length of segment ab?
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This segment creates a right triangle with the x and y axis. The two legs are 8 units and 6 units. Using the Pythagorean theorem, we know that 8^2+6^2=x^2, when x is the length of AB. 8^2+6^2=100. 
Therefore, 100=x^2
We can then take the square root of both sides to find that:
x=10.
Hope this is helpful!

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