# Program to find the Area and Perimeter of a Semicircle

Given the radius of the semicircle as r, the task is to find out the Area and Perimeter of that semicircle.

Examples:

```Input: r = 10
Output: Area = 157.00, Perimeter = 31.4

Input: r = 25
Output: Area =981.250000, Perimeter = 78.500000
```

## Recommended: Please try your approach on {IDE} first, before moving on to the solution.

Approach:
In mathematics, a semicircle is a one-dimensional locus of points that forms half of a circle. The area of a semicircle is half the area of the circle from which it is made. Any diameter of a circle cuts it into two equal semicircles.

Area of Semi-Circle = 12 * π *r2
Perimeter of Semi-Circle = π *r

where “r” is the radius of the semicircle.

Below is the implementation of the above approach:

 `// C++ program to find the ` `// Area and Perimeter of a Semicircle ` ` `  `#include ` `using` `namespace` `std; ` ` `  `// Function for calculating the area ` `float` `area(``float` `r) ` `{ ` `    ``// Formula for finding the area ` `    ``return` `(0.5)*(3.14)*(r * r); ` `} ` ` `  `// Function for calculating the perimeter ` `float` `perimeter(``float` `r) ` `{ ` `    ``// Formula for finding the perimeter ` `    ``return` `(3.14)*(r); ` `} ` ` `  `// driver code ` `int` `main() ` `{ ` ` `  `    ``// Get the radius ` `    ``int` `r = 10; ` ` `  `    ``// Find the area  ` `    ``cout << ``"The Area of Semicircle: "` `         ``<< area(r) << endl; ` ` `  `    ``// Find the perimeter ` `    ``cout << ``"The Perimeter of Semicircle: "` `         ``<< perimeter(r) << endl; ` ` `  `    ``return` `0; ` `} `

 `// C program to find the ` `// Area and Perimeter of a Semicircle ` ` `  `#include ` ` `  `// Function for calculating the area ` `float` `area(``float` `r) ` `{ ` `    ``// Formula for finding the area ` `    ``return` `(0.5)*(3.14)*(r * r); ` `} ` ` `  `// Function for calculating the perimeter ` `float` `perimeter(``float` `r) ` `{ ` `    ``// Formula for finding the perimeter ` `    ``return` `(3.14)*(r); ` `} ` ` `  `// driver code ` `int` `main() ` `{ ` ` `  `    ``// Get the radius ` `    ``float` `r = 10; ` ` `  `    ``// Find the area ` `    ``printf``(``"The Area of Semicircle: %f\n"``, ` `        ``area(r)); ` ` `  `    ``// Find the perimeter ` `    ``printf``(``"The Perimeter of Semicircle: %f\n"``, ` `        ``perimeter(r)); ` `    ``return` `0; ` `} `

 `// Java program to find the ` `// Area and Perimeter of a Semicircle ` ` `  `import` `java.io.*; ` ` `  `class` `GFG { ` ` `  `// Function for calculating the area ` `static` `float` `area(``float` `r) ` `{ ` `    ``// Formula for finding the area ` `    ``return` `(``float``)((``0.5``)*(``3.14``)*(r * r)); ` `} ` ` `  `// Function for calculating the perimeter ` `static` `float` `perimeter(``float` `r) ` `{ ` `    ``// Formula for finding the perimeter ` `    ``return` `(``float``)((``3.14``)*(r)); ` `} ` ` `  `// driver code ` ` `  `    ``public` `static` `void` `main (String[] args) { ` `    ``// Get the radius ` `    ``float` `r = ``10``; ` ` `  `    ``// Find the area ` `    ``System.out.println(``"The Area of Semicircle: "``+ ` `        ``area(r)); ` ` `  `    ``// Find the perimeter ` `    ``System.out.println(``"The Perimeter of Semicircle:"``+ ` `        ``+perimeter(r)); ` `    ``} ` `} ` ` ``// This code is contributed ` `// by anuj_67.. `

 `# Python3 program to find the ` `# Area and Perimeter of a Semicircle ` ` `  `# Function for calculating the area ` `def` `area(r): ` `     `  `    ``# Formula for finding the area ` `    ``return` `(``0.5``)``*``(``3.14``)``*``(r ``*` `r) ` ` `  `#Function for calculating the perimeter ` `def` `perimeter(r): ` `     `  `    ``#Formula for finding the perimeter ` `    ``return` `(``3.14``)``*``(r) ` ` `  `# driver code ` `if` `__name__``=``=``'__main__'``: ` `    ``# Get the radius ` `    ``r ``=` `10` ` `  `    ``# Find the area  ` `    ``print` `(``"The Area of Semicircle: "` `           ``,area(r)) ` ` `  `    ``# Find the perimeter ` `    ``print` `(``"The Perimeter of Semicircle: "` `           ``,perimeter(r)) ` `            `  `# This code is contributed by  ` `# SURENDRA_GANGWAR `

 `// C# program to find the ` `// Area and Perimeter of a Semicircle ` `using` `System; ` ` `  `class` `GFG { ` ` `  `// Function for calculating the area ` `static` `float` `area(``float` `r) ` `{ ` `    ``// Formula for finding the area ` `    ``return` `(``float``)((0.5)*(3.14)*(r * r)); ` `} ` ` `  `// Function for calculating the perimeter ` `static` `float` `perimeter(``float` `r) ` `{ ` `    ``// Formula for finding the perimeter ` `    ``return` `(``float``)((3.14)*(r)); ` `} ` ` `  `// Driver Code ` `public` `static` `void` `Main() ` `{ ` `    ``// Get the radius ` `    ``float` `r = 10; ` `     `  `    ``// Find the area ` `    ``Console.WriteLine(``"The Area of Semicircle: "` `+ ` `                                         ``area(r)); ` `     `  `    ``// Find the perimeter ` `    ``Console.WriteLine(``"The Perimeter of Semicircle:"` `+  ` `                                        ``perimeter(r)); ` `} ` `} ` ` `  `// This code is contributed ` `// by Akanksha Rai(Abby_akku) `

 ` `

Output:
```The Area of Semicircle: 157.000000
The Perimeter of Semicircle: 31.400000
```

Attention reader! Don’t stop learning now. Get hold of all the important DSA concepts with the DSA Self Paced Course at a student-friendly price and become industry ready.

Check out this Author's contributed articles.

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.

Practice Tags :