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In this article, we've created some programs in Python, to find and print the perimeter value of a triangle based on inputs such as length of all three sides, length of base and height etc. by user at run-time. Here are the list of programs:

- Find Perimeter of Triangle with 3 Sides
- Find Perimeter of All Types of Triangle
- Find Perimeter of Triangle using Function
- Using Class

Before starting these programs, if you're not aware about formula used to find perimeter of triangle, refer to Perimeter of Triangle Formula to get every required thing.

**Note - **Perimeter of a triangle can be calculated as summing up all its three sides, that is
**length_of_first_side + length_of_second_side + length_of_third_side**.

This Python program asks from user to enter the length of all three sides of triangle, to find the perimeter value
of that triangle. The question is, **write a Python program to find and print perimeter of triangle.** Here is its answer:

print("Enter the Length of First Side: ") a = int(input()) print("Enter the Length of Second Side: ") b = int(input()) print("Enter the Length of Third Side: ") c = int(input()) p = a+b+c print("\nPerimeter = ", p)

Here is its sample run:

Above is the initial output. Now enter the length of all three sides one by one say **2** as length of first,
**3** as length of second, and **5** as length of third side. Press `ENTER`

key to find and print the
perimeter value as shown in the snapshot given below:

In this program, using **{:.2f}** with **format()**, we've restricted the value of **p** to output upto
only two decimal places. And the **end** is used to skip an automatic newline using **print()**.

print("Enter Length all Three Sides: ", end="") a = float(input()) b = float(input()) c = float(input()) p = a+b+c print("\nPerimeter = {:.2f}".format(p))

Here is its sample run with user input, **2, 5, 3.4** as length of all three sides of triangle:

This program uses list to store length of all three sides of triangle. Rest of the things are similar to previous
program. The **append()** method is used to append element to the list.

print("Enter Length all Three Sides: ", end="") TriangleSides = [] p = 0 for i in range(3): TriangleSides.append(float(input())) p = p+TriangleSides[i] print("\nPerimeter = {:.2f}".format(p))

This program produces exactly same output as of previous program.

**Note - **Based on the side length of triangle, there are three types of triangles. That are, **Scalene**,
**Isosceles**, and **Equilateral** triangle.

ch = 1 while ch>=1 and ch<=3: print("1. Equilateral Triangle") print("2. Isosceles Triangle") print("3. Scalene Triangle") print("4. Exit") print("Enter Your Choice: ", end="") ch = int(input()) if ch==1: print("Enter the Side Length: ", end="") s = float(input()) p = 3*s print("Perimeter = {:.2f}\n".format(p)) elif ch==2: print("Enter Length of any one Side from Two Equal Sides: ", end="") a = float(input()) print("Enter Length of Third Side: ", end="") b = float(input()) p = (2*a)+b print("Perimeter = {:.2f}\n".format(p)) elif ch==3: print("Enter Length of all Three Sides: ", end="") a = [] p = 0 for i in range(3): a.append(float(input())) p = p + a[i] print("Perimeter = {:.2f}\n".format(p)) elif ch!=4: print("Invalid Input!") print("Try again...\n") ch = 1

Here is its initial output:

Now enter **1** as choice if you want to find perimeter of an equilateral triangle. Here is its sample run with
user choice as **1** and **7** as length of side:

This process continues, until you type **4** as choice to exit from the loop.

This program is created using user-defined function named **perOfTriangle()** that returns perimeter value of
a triangle based on the length of all three sides entered by user.

def perOfTriangle(x, y, z): return x+y+z print("Enter Length all Three Sides: ", end="") a = float(input()) b = float(input()) c = float(input()) p = perOfTriangle(a, b, c) print("\nPerimeter = {:.2f}".format(p))

This is the last program of this article, created using **class**, an object-oriented feature of Python to
do the same job as previous program. Let's have a look at the program:

class CodesCracker: def perOfTriangle(self, x, y, z): return x+y+z print("Enter Length all Three Sides: ", end="") a = float(input()) b = float(input()) c = float(input()) ob = CodesCracker() p = ob.perOfTriangle(a, b, c) print("\nPerimeter = {:.2f}".format(p))

An object named **ob** is created of type **CodesCracker** class to access its member function through
**dot (.)** operator. Rest of the things are similar to normal function.

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