Answer:
HK = 17
Step-by-step explanation:
When a tangent is present on a circle, it creates a 90° angle with the radius. With that in mind, we can use Pythagorean Theorem: a² + b² = c²
8² + 15² = HK²
HK = √(8² + 15²)
HK = √289
HK = 17
You should get your answer!