class Sirkel:

    def __init__(self, radius):
        self._radius = radius
        self._pi = 3.14

    def hentDiameter(self):
        return self._radius * 2

    def hentOmkrets(self):
        return self.hentDiameter() * self._pi

    def hentAreal(self):
        return (self._radius ** 2) * self._pi