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import math
def bereken_zijde(x1: float, y1: float, x2: float, y2: float) -> float:
...
def bereken_oppervlakte(x1: float, y1: float, x2: float, y2: float, x3: float, y3: float) -> float:
...
x1 = float(input("x-coördinaat punt A:"))
y1 = float(input("y-coördinaat punt A:"))
x2 = float(input("x-coördinaat punt B:"))
y2 = float(input("y-coördinaat punt B:"))
x3 = float(input("x-coördinaat punt C:"))
y3 = float(input("y-coördinaat punt C:"))
oppervlakte = ...
print("De oppervlakte van de driehoek is", ...)