find the length indicated. Assume that lines which appear to be tangent are tangent.

9514 1404 393
Answer:
A) 15
Step-by-step explanation:
The angle where the tangent meets the radius is 90°, so the Pythagorean theorem applies to this right triangle.
?² +8² = 17²
?² = 289 -64 = 225
? = √225 = 15
The unknown side length is 15.