In this article we will show you, How to write Python Program to find Volume and Surface Area of a Cylinder with example. Before we step into the program, Let see the definitions and formulas behind Surface Area of a Cylinder, Lateral Surface Area, Top or Bottom Surface Area and Volume of a Cylinder.

### Surface Area of a Cylinder

If we know the radius and height of the cylinder then we can calculate the surface area of a cylinder using the formula:

Surface Area of a Cylinder = 2πr² + 2πrh (Where r is radius and h is the height of the cylinder).

### Volume of a Cylinder

The amount of space inside the Cylinder is called as Volume.** **If we know the height of a cylinder then we can calculate the Volume of a cylinder using formula:

Volume of a Cylinder = πr²h

The Lateral Surface Area of a Cylinder = 2πrh

We can calculate the Top Or Bottom Surface Area of a Cylinder = πr²

## Python Program to find Volume & Surface Area of a Cylinder

This Python program allows the user to enter the value of a radius and height. Using these values, it will calculate the Volume of a Cylinder, Surface Area of a Cylinder, Lateral Surface Area of a Cylinder, Top Or Bottom Surface Area of a Cylinder as per the formula.

**PYTHON CODE**

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# Python Program to find Volume & Surface Area of a Cylinder PI = 3.14 radius = float(input('Please Enter the Radius of a Cylinder: ')) height = float(input('Please Enter the Height of a Cylinder: ')) sa = 2 * PI * radius * (radius + height) Volume = PI * radius * radius * height L = 2 * PI * radius * height T = PI * radius * radius print("\n The Surface area of a Cylinder = %.2f" %sa) print(" The Volume of a Cylinder = %.2f" %Volume) print(" Lateral Surface Area of a Cylinder = %.2f" %L); print(" Top OR Bottom Surface Area of a Cylinder = %.2f" %T) |

**ANALYSIS**

First, We declared PI variable and assigned the value as 3.14.

Below statements will ask the user to enter radius and height values and it will assign the user input values to respected variables. Such as first value will be assigned to radius and second value to height

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radius = float(input('Please Enter the Radius of a Cylinder: ')) height = float(input('Please Enter the Height of a Cylinder: ')) |

Next, We are calculating Volume, Surface Area, Lateral Surface Area, Top Or Bottom Surface Area of a Cylinder using their respective Formulas:

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sa = 2 * PI * radius * (radius + height) Volume = PI * radius * radius * height L = 2 * PI * radius * height T = PI * radius * radius |

Following print statements will help us to print the Volume and Surface area of a Cylinder

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print("\n The Surface area of a Cylinder = %.2f" %sa) print(" The Volume of a Cylinder = %.2f" %Volume) print(" Lateral Surface Area of a Cylinder = %.2f" %L); print(" Top OR Bottom Surface Area of a Cylinder = %.2f" %T) |

**OUTPUT**

We have entered the radius of a Cylinder = 3 and height = 5

The **Surface Area of a Cylinder** is

Surface Area of a Cylinder= 2πr² + 2πrh

It can also be written as

Surface Area of a Cylinder = 2πr (r+h)

Surface Area of a Cylinder = 2 * PI * radius * (radius + height)

Surface Area of a Cylinder = 2 * 3.14 * 3 * (3+5);

Surface Area of a Cylinder = 150.72

The **Volume of a Cylinder** is

Volume of a Cylinder = πr²h

Volume of a Cylinder = PI * radius * radius * height

Volume of a Cylinder = 3.14 * 3 * 3 * 5

Volume of a Cylinder = 141.3

The Lateral Surface Area of a Cylinder is

L = 2πrh

L = 2 * PI * radius * height

L = 2 * 3.14 * 3 * 5

L = 94.2

The **Top Or Bottom Surface Area of a Cylinder** is

T = πr²

T = PI * radius * radius

T = 3.14 * 3 * 3

T = 28.26

**NOTE:** For the calculation purpose we have taken π = 3.14 instead of (3.142857142..). So, All the above values are almost equal to program output but may differ at 0.01.

## Python Program to find Volume & Surface Area of a Cylinder using functions

This program allows user to enter the value of a radius and height. We will pass the radius value to the function argument and then it will calculate the Volume of a Cylinder, Surface Area of a Cylinder, Lateral Surface Area of a Cylinder, Top Or Bottom Surface Area of a Cylinder as per the formula.

**PYTHON CODE**

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# Python Program to find Volume & Surface Area of a Cylinder using Functions import math def Vol_Sa_Cylinder(radius, height): sa = 2 * math.pi * radius * (radius + height) Volume = math.pi * radius * radius * height L = 2 * math.pi * radius * height T = math.pi * radius * radius print("\n The Surface area of a Cylinder = %.2f" %sa) print(" The Volume of a Cylinder = %.2f" %Volume) print(" Lateral Surface Area of a Cylinder = %.2f" %L) print(" Top OR Bottom Surface Area of a Cylinder = %.2f" %T) Vol_Sa_Cylinder(6, 4) |

**OUTPUT**

**ANALYSIS**

First, We imported the math library using the following statement. This will allow us to use the mathematical functions like math.pi. If you fail to include this line then math.pi will through an error.

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import math |

Step 2: We defined the function with two argument using def keyword. It means, User will enter the radius and height of a Cylinder.

Step 3: We are calculating Volume, Surface Area, Lateral Surface Area, Top Or Bottom Surface Area of a Cylinder as we explained in first example

**NOTE:** We can call the function with arguments in .py file directly or else we can call it from the python shell. Please don’t forget the function arguments

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