**by BehindJava**

# Write a program to find the area of a triangle in Python

In this tutorial we are going to learn about finding the area of triangle in Python.

#### Mathematical formula:

**Area of a triangle = (s (s-a)(s-b)*(s-c))-1/2**

```
# inputs from the user
a = float(input('Enter length of first side: '))
b = float(input('Enter length of second side: '))
c = float(input('Enter length of third side: '))
# Calculate the semi-perimeter
s = (a + b + c) / 2
# calculate the area
area = (s*(s-a)*(s-b)*(s-c)) ** 0.5
```

# Calculate the Area of a Triangle using function

```
def areaOfTriangle(a,b,c):
# calculate the semi-perimeter
s = (a + b + c) / 2
# calculate the area
area = (s * (s - a) * (s - b) * (s - c)) ** 0.5
print('The area of a traingle is %0.2f' %area)
# Initialize first side of traingle
a = 21
# Initialize second side of traingle
b = 23
# Initialize third side of traingle
c = 35
areaOfTriangle(a,b,c)
```

# Calculate area of triangle using Math file

```
# Python Program to find the area of triangle
# import math file
import math
# inputs from the user
a = float(input('Enter length of first side: '))
b = float(input('Enter length of second side: '))
c = float(input('Enter length of third side: '))
# calculate the semi-perimeter
s = (a + b + c) / 2
# calculate the area of triangle
area = math.sqrt(s * (s - a) * (s - b) * (s - c))
# display result
print('The area of the triangle is %0.2f' %area)
```