$\"\"$

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Radius of the circle T is given by 13 units.

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TX,TZ,TX be the radii of the circle T.

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$\"\"$ and ZV = 1.

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$\"\"$

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$\"\"$ (Substitute $\"\"$ and ZV = 1)

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$\"\"$ (Subtract 1 from each side)

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$\"\"$ (Simplify)

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$\"\"$

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$\"\"$

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Use Pythagorean theorem to find XV.

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$\"\"$ (Apply Pythagorean theorem)

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$\"\"$ (Substitute $\"\"$ )

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$\"\"$ (Evaluate powers)

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$\"\"$ (Subtract 144 from each side)

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$\"\"$ (Subtract)

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$\"\"$ (Apply square root of each side) $\"\"$

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The value of $\"\"$ .