To find the length of a Two-Dimensional Line, let’s take the following line, *AB*.

We can use the equation for the length of a Two-Dimensional Line, to find the length of *AB*.

In this case, *x*_{1} is 9, *x*_{2} is -1, *y*_{1} is 2, and *y*_{2} is 6. Plugging those values into the equation gives us:

Subtracting the-9 from the -1 gives us 10, and subtracting 2 from 6 gives us -4.

Squaring the 10 gives us 100, and squaring the 4 gives us 16.

Adding the 16 and 100 together gives us 116, so the length of the line is the square root of 116.

While 116 is not a perfect square, it is a multiple of 4, which is a perfect square so we can factor out a 4 to simplify the radical. So, the square root of 116 can simplify down to 2 times the square root of 29.

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