[Python] How can I call a function within a class?

I have this code which calculates the distance between two coordinates. The two functions are both within the same class.

However, how do I call the function distToPoint in the function isNear?

class Coordinates:
def distToPoint(self, p):
"""
Use pythagoras to find distance
(a^2 = b^2 + c^2)
"""
...

def isNear(self, p):
distToPoint(self, p)
...


Currently I get a NameError:

Traceback (most recent call last):
File "path/to/file.py", line 14, in <module>
Coordinates().isNear((1, 2))
File "path/to/file.py", line 10, in isNear
distToPoint(self, p)
NameError: name 'distToPoint' is not defined

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