Respuesta :

Answer:

TR = 3 units

Step-by-step explanation:

Recall: tangents drawn from an external point are equal to each other

Therefore,

TR = UR

We need to find UR first

Thus:

UR = PR - UP

PR = 12 (given)

UP = SP = 9 (tangents drawn from an external point are congruent)

UR = 12 - 9

UR = 3 units

Therefore,

TR = UR = 3

TR = 3 units

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