Python Program to Calculate the Area of a Triangle

In this post, we will learn how to calculate the area of a triangle using Python Programming language.

One of the easiest way to calculate the area of the triangle is by using the Heron’s formula:

Area of Triangle = (s * (s – a) * (s – b) * (s – c)) ** 0.5, where a, b and c are the three sides of the triangle and s is the semi-perimeter of the triangle.

We will be computing the area of the triangle using the following methods:

1. Using Standard Method
2. Using Functions
3. Using Math File
4. Area of Right Angled Triangle

So, without further ado, let’s begin this tutorial.

Python Program to Calculate the Area of a Triangle

```# Python Program to Calculate the Area of a Triangle

a = float(input("Enter the first side of the triangle: "))
b = float(input("Enter the second side of the triangle: "))
c = float(input("Enter the third side of the triangle: "))

# Calculating the semi-perimeter
s = (a + b + c) / 2

# Calculating area
area = (s * (s - a) * (s - b) * (s - c)) ** 0.5

# Displaying output
print("Area of triangle: ", area)
```

Output

``````Enter the first side of the triangle: 3
Enter the second side of the triangle: 4
Enter the third side of the triangle: 5
Area of triangle:  6.0
``````

How Does This Program Work ?

```a = float(input("Enter the first side of the triangle: "))
b = float(input("Enter the second side of the triangle: "))
c = float(input("Enter the third side of the triangle: "))
```

In this program, the user is asked to enter the three sides of the triangle.

```# Calculating the semi-perimeter
s = (a + b + c) / 2
```

Then, we calculate the semi-perimeter of the triangle.

```# Calculating area
area = (s * (s - a) * (s - b) * (s - c)) ** 0.5
```

Area of the triangle is calculated using the Heron’s Formula.

```# Displaying output
print("Area of triangle: ", area)
```

Finally, the result is displayed on the screen using print() function.

Python Program to Calculate the Area of a Triangle Using Functions

```# Python Program to Calculate the Area of a Triangle Using Functions
def area(a, b, c):
s = (a + b + c) / 2

# Calculating area
area = (s * (s - a) * (s - b) * (s - c)) ** 0.5
print("Area of the triangle: %.2f" %area)

a = float(input("Enter the first side of the triangle: "))
b = float(input("Enter the second side of the triangle: "))
c = float(input("Enter the third side of the triangle: "))

# Calling out the function
area(a, b, c)
```

Output

``````Enter the first side of the triangle: 10
Enter the second side of the triangle: 12
Enter the third side of the triangle: 15
Area of the triangle: 59.81
``````

Python Program to Calculate the Area of a Triangle Using Math File

```# Python Program to Calculate the Area of a Triangle Using Math File
import math

a = float(input("Enter the first side of the triangle: "))
b = float(input("Enter the second side of the triangle: "))
c = float(input("Enter the third side of the triangle: "))

if (a < 0 or b < 0 or c < 0 or (a + b <= c) or (a + c <= b) or (b + c <= a)):
print("Triangle is not possible")

else:

# Calculating the semi-perimeter
s = (a + b + c) / 2

# Calculating area
area = math.sqrt(s * (s - a) * (s - b) * (s - c))

# Displaying the output
print("Area of the triangle: %.2f" %area)
```

Output 1

``````Enter the first side of the triangle: 3
Enter the second side of the triangle: 6
Enter the third side of the triangle: 10
Triangle is not possible
``````

Output 2

``````Enter the first side of the triangle: 5
Enter the second side of the triangle: 5
Enter the third side of the triangle: 5
Area of the triangle: 10.83
``````

Python Program to Calculate the Area of a Right Angled Triangle

```# Python Program to Calculate the Area of a Triangle

base = float(input("Enter the base of the triangle: "));
height = float(input("Enter the height of the triangle: "));

# Computing the area of triangle
area = (1/2) * base * height;

# Displaying output
print("Area of triangle: ", area)
```

Output

``````Enter the base of the triangle: 5
Enter the height of the triangle: 12
Area of triangle:  30.0
``````

Conclusion

I hope after going through this post, you understand how to calculate the area of a triangle using Python Programming language.

If you have any doubt regarding the program, feel free to contact us in the comment section. We will be delighted to help you.