Greetings from Brasil...
The expression that allows you to calculate the distance between two points is:
d(A; B) = √[(Xb - Xa)² + (Yb - Ya)²]
Bringing to our problem:
d(A; B) = √[(9 - 0)² + (14 - 2)²]
d(A; B) = √[9² + 12²]
d(A; B) = √[81 + 144]
d(A; B) = √[225]
d(A; B) = 15