Answer:
35
Step-by-step explanation:
since KJ is a tangent to angle HJK is right 90°
then triangle KHJ is right triangle with hypothenus HK = 37
applying pytha
hk ² = kj ² + hj ²
37² = 12² + radius²
radius = sqrt (37² - 12²)
radius = sqrt (1225)
radius = 35
