Project 4 desired result and error messages

RESULTS I WANT:
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DISTANCE PRACTICE
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Enter x1: 1.3
Enter y1: 4.5
Enter x2: 8.9
Enter y2: 11.3
Distance = 8.1234
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MIDPOINT PRACTICE
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Enter x1: 7.8
Enter y1: 1.4
Enter x2: 15.6
Enter y2: 18.3
Midpoint x = 13.2345
Midpoint y = 3.3456
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RADIUS PRACTICE
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Enter center x: 4.5
Enter center y: 7.8
Enter point x: 9.3
Enter point y: 11.5
Radius = 17.4567
That wraps up practice time. See you next time!

MY ERROR MESSAGES:
Traceback (most recent call last):
  File "C:\Users\jorda\AppData\Local\Programs\Python\Python312\ZewedeProj4.py", line 42, in <module>
    main()
  File "C:\Users\jorda\AppData\Local\Programs\Python\Python312\ZewedeProj4.py", line 7, in main
    doDistancePractice("DISTANCE PRACTICE")
  File "C:\Users\jorda\AppData\Local\Programs\Python\Python312\ZewedeProj4.py", line 23, in doDistancePractice
    print("Distance =", distance,"\n")
NameError: name 'distance' is not defined. Did you mean: 'isinstance'?