Radius of the circle T is given by 13 units.

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

and ZV = 1.

                                       (Substitute and ZV = 1)

                             (Subtract 1 from each side)

                                             (Simplify)

Use Pythagorean theorem to find XV.

                        (Apply Pythagorean theorem)

                        (Substitute )

                             (Evaluate powers)

           (Subtract 144 from each side)

                                         (Subtract)

                                                (Apply square root of each side)

The value of .