# Python program to find area of a triangle

*By Lenin Mishra*

According to Heron’s formula,
if `a`

, `b`

and `c`

are the three sides of a triangle, the area of the triangle is:-

where `s`

is the semi-perimeter of the triangle.

#### Method 1

**Code**

```
a = 10
b = 12
c = 13
# 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 our triangle is %0.2f' %area)
```

**Output**

`The area of our triangle is 57.00`

#### Method 2 - User Input

**Code**

```
a = float(input('Enter 1st side: '))
b = float(input('Enter 2nd side: '))
c = float(input('Enter 3rd side: '))
# 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 our triangle is %0.2f' %area)
```

**Output**

```
Enter 1st side: 10
Enter 2nd side: 12
Enter 3rd side: 13
The area of our triangle is 57.00
```