Write a Python Program to Calculate the Area of a Triangle

In this tutorial you will learn to write a simple Python program to calculate the Area of a Triangle when values of three sides are provided.

Formula to Calculate area of the Triangle.

When all three sides of the triangle are known, we can use Heron's formula to calculate the area.

If a, b and c are three sides of a triangle, then first we calculate the Semi Perimeter using the formula

s = (a+b+c)/2

here s will contain Semi Perimeter

After that we calculate Area using the formula

Area = √(s(s-a)*(s-b)*(s-c))

Python example program

 1 # Python Program to find the area of triangle
 3 # Get sides of the Triangle from the user
 4 a = float(input('Enter first side: '))
 5 b = float(input('Enter second side: '))
 6 c = float(input('Enter third side: '))
 8 # calculate the Semi Perimeter
 9 s = (a + b + c) / 2
11 # calculate the Area
12 area = (s*(s-a)*(s-b)*(s-c)) ** 0.5
14 # Display Result
15 print('The area of the triangle is %0.2f' %area)

Program Output : Run 1

Enter first side: 5

Enter second side: 6

Enter third side: 4

The area of the triangle is 9.92