How to find area of a triangle in Python

In this python tutorial, you will learn about how to find area of a triangle in Python, the Python program to find the area of a triangle and, also we will check:

• Python program to find the area of a triangle
• Python program to calculate the area of a triangle using function
• Python program to find the area of a triangle given all three sides
• Python program to find the area of a triangle using class
• Python program to find the area of a triangle when base and height are given
• Python program to find the area of a triangle using function when base and height are given

Python program to find the area of a triangle

Let see python program to find the area of a triangle.

• In this example, we will ask the user to enter the length of three sides of a triangle.
• We will use Heron’s formula to calculate the semi-perimeter.
• And Area = (s*(s-a)*(s-b)*(s-c)) ** 0.5 to calculate the area of the triangle.
• At last, print the area of the triangle to get the output.

Example:

a = float(input('Enter the length of first side: '))  
b = float(input('Enter  the length of second side: '))  
c = float(input('Enter  the length of third side: '))  
s = (a + b + c) / 2  
Area = (s*(s-a)*(s-b)*(s-c)) ** 0.5  
print('The area of the triangle is %0.2f' %Area)

You can refer to the below screenshot to see the output for the python program to find the area of a triangle.

The above code we can use to find area of a triangle in Python.

Also, read, Python program to find the area of square.

Python program to calculate area of a triangle using function

Now, we will see python program to calculate the area of a triangle using function.

• Firstly, we will import math module which will allow us to use the mathematical function like math.sqrt function.
• Now, we will define the function with three arguments using the def keyword as def Areaoftriangle(a, b, c).
• We will use Heron’s formula to calculate the semi-perimeter.
• And Area = math.sqrt((s*(s-a)*(s-b)*(s-c)))to calculate the area of the triangle.
• The user will enter the three sides of the triangle a,b,c and we will pass those values to function arguments to calculate the area.
• At last, print is used to get the output.

Example:

import math
def Areaoftriangle(a, b, c):
    Perimeter = a + b + c
    s = (a + b + c) / 2
    Area = math.sqrt((s*(s-a)*(s-b)*(s-c)))
    print("The perimeter of traiangle = %.2f" %Perimeter);
    print("The Semi Perimeter of traiangle = %.2f" %s);
    print("The Area of a triangle is %0.2f" %Area)
Areaoftriangle(8, 9, 10)

You can refer to the below screenshot to see the output for python program to calculate the area of a triangle using function.

The above code, we can use to calculate area of a triangle using function in Python.

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Python program to find area of a triangle given all three sides

Here, we will see python program to find the area of a triangle given all three sides

• Firstly, we will import math module which will allow us to use the mathematical function like math.sqrt function.
• We will ask the user to enter the length of three sides of a triangle and it will be stored in a separate variable.
• We will use Heron’s formula for calculating the semi-perimeter which is s=(a+b+c)/2.
• And Area = math.sqrt(s*(s-a)*(s-b)*(s-c)) to calculate the area of the triangle.
• At last, print the area of the triangle to get the output.

Example:

import math
a=int(input("Enter the length of first side: "))
b=int(input("Enter the length of second side: "))
c=int(input("Enter the length of third side: "))
s=(a+b+c)/2
Area=math.sqrt(s*(s-a)*(s-b)*(s-c))
print("Area of the triangle is: ",round(Area,2))

You can refer to the below screenshot to see the output for the python program to find the area of a triangle given all three sides.

This is the python program to find area of a triangle given all three sides.

Check out, How to calculate area of a circle in Python?

Python program to find area of a triangle using class

Let’s see python program to find the area of a triangle using class

• We will create a class called class sides.
• Another class called class A(sides) it has a method called def area(self) return (s*(s-self.a)*(s-self.b)*(s-self.c)) ** 0.5 which is the area of the class.
• An object for the class is created as obj = A(10,12,14).
• By using the object, the method area() is called.
• At last, print the area of a rectangle to see the output.

Example:

class sides:
    def __init__(self,a, b, c):
        self.a = a
        self.b = b
        self.c = c
class A(sides):
    def area(self):
        s = (self.a + self.b + self.c)/2
        return (s*(s-self.a)*(s-self.b)*(s-self.c)) ** 0.5
obj = A(10,12,14)
print("Area of triangle : {}".format(obj.area()))

You can refer to the below screenshot to see the output for the python program to find the area of a triangle using class.

Also, read, How to calculate simple interest in Python?

Python program to find area of a triangle when base and height are given

Now, we will see python program to find the area of a triangle when base and height are given

• In this example, we will ask the user to enter the base and height of a triangle.
• To calculate the area of a triangle we will use the formula Area = (b * h)/2.
• At last, print the area of the triangle to get the output.

Example:

b = float(input('Enter the base of a triangle: '))  
h = float(input('Enter the height of a triangle: '))  
Area = (b * h)/2
print('The area of the triangle is %0.2f' %Area)

You can refer to the below screenshot to see the output for the python program to find the area of a triangle when base and height are given.

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Python program to find area of a triangle using function when base and height are given

Here, we will see a python program to find the area of a triangle using function when base and height are given

• In this example, we will define the function as def Area(base, height).
• Here, Area(10, 15) is the value passed to the function argument.
• At last, it will return the area of the triangle and print the output.

Example:

def Area(base, height):
   return 0.5 * base * height
print(Area(10, 15))

You can refer to the below screenshot to see the output for the python program to find the area of a triangle using function when base and height are given.

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In this Python tutorial, we have learned about the Python program to find the area of a triangle. Also, we covered these below topics:

• Python program to find the area of a triangle
• Python program to calculate the area of a triangle using function
• Python program to find the area of a triangle given all three sides
• Python program to find the area of a triangle using class
• Python program to find the area of a triangle when base and height are given
• Python program to find the area of a triangle using function when base and height are given