Calculate the area of the Triangle using Class and Inheritance

Question

Hey guys I'm trying to find out the area of the triangle using the Heron's formula i.e area= sqrt(s(s-l1)(s-l2)(s-l3)). For this, I need to check if the given sides add up to the triangle, which I have.

However, I'm not able to figure out how to use this in the inherited class here.

What, I want to do is take input from the parent class and calculate area from the inherited class. Any help is appreciated.

Nomenclature used 1) l1, l2, l3 : sides of the triangle 2) Checktri method is used to check if the given sides add up to a triangle or not 3) Areatri is the inherited class of Triangledim wherein the area need to be found out

import math
class Triangledim:
    def __init__(self, l1, l2, l3):
        self.l1 = l1
        self.l2 = l2
        self.l3 = l3

#Check if the given measurements form a triangle
    def checktri(self):
        if (self.l1+self.l2>self.l3) & (self.l2+self.l3>self.l1) & (self.l1+self.l3>self.l2):
            s = (self.l1 +self.l2+self.l3)/2
            return ("Perimeter of the triangle is %f" %s)
        else : 
            return("not the right triangle proportions") 

class Areatri(Triangledim):
      def __init__(self):
            Triangledim.__init__(self)
            area = math.sqrt(self.s(self.s-self.l1)(self.s-self.l2)(self.s-self.l3))
            return area


p=Triangledim(7,5,10)

Answer 1

The following code is what you probably need:

import math

class Triangledim():

    def __init__(self, l1, l2, l3):
        self.l1 = l1
        self.l2 = l2
        self.l3 = l3
        self.s = (self.l1+self.l2+self.l3) / 2.0

    def checktri(self):
        if (self.l1+self.l2>self.l3) and (self.l2+self.l3>self.l1) and (self.l1+self.l3>self.l2): 
            print("Perimeter of the triangle is: {}".format(self.s))
        else: 
            print("not the right triangle proportions") 

    def findArea(self):
        area = math.sqrt(self.s*(self.s-self.l1)*(self.s-self.l2)*(self.s-self.l3))
        print("The area of the triangle is: {}".format(area))

if __name__ == "__main__":
    p = Triangledim(7,5,10)
    p.checktri()
    p.findArea()

Output:

Perimeter of the triangle is: 11.0
The area of the triangle is: 16.24807680927192

In case you want to use heritage, the following will do the job for you:

import math

class Triangledim():

    def __init__(self, l1, l2, l3):
        self.l1 = l1
        self.l2 = l2
        self.l3 = l3
        self.s = (self.l1+self.l2+self.l3) / 2.0

    def checktri(self):
        if (self.l1+self.l2>self.l3) and (self.l2+self.l3>self.l1) and (self.l1+self.l3>self.l2): 
            print("Perimeter of the triangle is: {}".format(self.s))
        else: 
            print("not the right triangle proportions") 

class Areatri(Triangledim):
    def findArea(self):
        area = math.sqrt(self.s*(self.s-self.l1)*(self.s-self.l2)*(self.s-self.l3))
        print("The area of the triangle is: {}".format(area))

if __name__ == "__main__":
    p = Areatri(7,5,10)
    p.checktri()
    p.findArea()

Output:

Perimeter of the triangle is: 11.0
The area of the triangle is: 16.24807680927192