Answer
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Work Step by Step
# 13.11 (The Triangle class) Modify the Triangle class in Programming Exercise 12.1
# to throw a RuntimeError exception if the three given sides cannot form a
# triangle.
import math
class GeometricObject:
def __init__(self, color="green", filled=True):
self.__color = color
self.__filled = filled
def getColor(self):
return self.__color
def setColor(self, color):
self.__color = color
def isFilled(self):
return self.__filled
def setFilled(self, filled):
self.__filled = filled
def __str__(self):
return "color: " + self.__color + \
" and filled: " + str(self.__filled)
class Triangle(GeometricObject):
def __init__(self, side1=1.0, side2=1.0, side3=1.0, color="green", isFilld=True):
super().__init__(color, isFilld)
self.__side1 = side1
self.__side2 = side2
self.__side3 = side3
if not self.isLegal():
raise RuntimeError()
def isLegal(self):
return self.__side1 + self.__side2 > self.__side3 and \
self.__side2 + self.__side3 > self.__side1 and \
self.__side1 + self.__side3 > self.__side2
def getSide1(self):
return self.__side1
def setSide1(self, side1):
self.__side1 = side1
def getSide2(self):
return self.__side2
def setSide2(self, side2):
self.__side2 = side2
def getSide3(self):
return self.__side3
def setSide3(self, side3):
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):
return super().__str__() + " Triangle: side1 = " + str(self.__side1) + " side2 = " + \
str(self.__side2) + " side3 = " + str(self.__side3)
def main():
try:
s1, s2, s3 = eval(input("Enter three sides of a Triangle: "))
color = input("Enter color of a triangle: ")
isFilled = bool(int(input("Is the triangle filled? (1 or 0): ")))
trngl = Triangle(s1, s2, s3, color, isFilled)
print("Triangle's area is:", trngl.getArea())
print("Triangle's perimeter is:", trngl.getPerimeter())
print(trngl)
except RuntimeError:
print("Cannot form a triangle")
main()
