Python - example

# oryginal:
#  https://pastebin.com/bFMBQ81H
#  https://pastebin.com/Wv7gc6bp

import math

class GeometricObject:

    def __init__(self):
        self.color= 'black'
        self.filled = False

    def getColor(self):
        return self.color

    def getFilled(self):
        return self.filled

    def setColor(self, color):
        self.color = color

    def setFilled(self, filled):
        self.filled = filled


class Triangle(GeometricObject):

    def __init__(self):
        super().__init__()
        self.side1 = 1.0
        self.side2 = 1.0
        self.side3 = 1.0

    def setSides(self, side1, side2, side3):
        if side1 + side2 <= side3:
            raise RuntimeError('The given three sides cannot from a triangle')
        elif side1 + side3 <= side2:
            raise RuntimeError('The given three sides cannot from a triangle')
        elif side3 + side2 <= side1:
            raise RuntimeError('The given three sides cannot from a triangle')
        self.side1 = side1
        self.side2 = side2
        self.side3 = side3

    def getArea(self):
        s = (self.side1 + self.side2 + self.side3)/2
        area = math.sqrt(s * (s-self.side1) * (s-self.side2) * (s-self.side3))
        return area

    def getPerimeter(self):
        return self.side1 + self.side2 + self.side3

    def __str__(self):
        if self.filled:
            fill = "yes"
        else:
            fill = "no"

        return "Triangle:\n side1 = {}\n side2 = {}\n side3 = {}\n color = {}\n filled: {}".format(self.side1, self.side2, self.side3, self.color, fill)


tria = Triangle()
tria.setFilled(True)
print(tria)
print(" Area:", tria.getArea())
print(" Perimeter:", tria.getPerimeter())

tria = Triangle()
tria.setSides(1,4,5)
print(tria)
print("Area:", tria.getArea())
print("Perimeter:", tria.getPerimeter())