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
