Given the length of diagonal ‘d1’ of a rhombus and a side ‘a’, the task is to find the area of that rhombus.

A

rhombusis a polygon having 4 equal sides in which both the opposite sides are parallel, and opposite angles are equal.

**Examples:**

Input:d = 15, a = 10Output:99.21567416492215Input:d = 20, a = 18Output:299.3325909419153

**Approach:**

- Get the diagonal ‘d1’ and side ‘a’ of the rhombus
- We know that,

- But since we don’t know the other diagonal d2, we cannot use this formula yet
- So we first find the second diagonal d2 with the help of d1 and a
- Now we can use the area formula to compute the area of the Rhombus

## C++

`// C++ program to calculate the area of a rhombus ` `// whose one side and one diagonal is given ` `#include<bits/stdc++.h> ` `using` `namespace` `std; ` ` ` `// function to calculate the area of the rhombus ` `double` `area(` `double` `d1, ` `double` `a) ` `{ ` ` ` ` ` `// Second diagonal ` ` ` `double` `d2 = ` `sqrt` `(4 * (a * a) - d1 * d1); ` ` ` ` ` `// area of rhombus ` ` ` `double` `area = 0.5 * d1 * d2; ` ` ` ` ` `// return the area ` ` ` `return` `area; ` `} ` ` ` `// Driver code ` `int` `main() ` `{ ` ` ` `double` `d = 7.07; ` ` ` `double` `a = 5; ` ` ` `printf` `(` `"%0.8f"` `, area(d, a)); ` `} ` ` ` `// This code is contributed by Mohit Kumar ` |

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## Java

`// Java program to calculate the area of a rhombus ` `// whose one side and one diagonal is given ` `class` `GFG ` `{ ` ` ` ` ` `// function to calculate the area of the rhombus ` ` ` `static` `double` `area(` `double` `d1, ` `double` `a) ` ` ` `{ ` ` ` ` ` `// Second diagonal ` ` ` `double` `d2 = Math.sqrt(` `4` `* (a * a) - d1 * d1); ` ` ` ` ` `// area of rhombus ` ` ` `double` `area = ` `0.5` `* d1 * d2; ` ` ` ` ` `// return the area ` ` ` `return` `area; ` ` ` `} ` ` ` ` ` `// Driver code ` ` ` `public` `static` `void` `main (String[] args) ` ` ` `{ ` ` ` `double` `d = ` `7.07` `; ` ` ` `double` `a = ` `5` `; ` ` ` `System.out.println(area(d, a)); ` ` ` `} ` `} ` ` ` `// This code is contributed by AnkitRai01 ` |

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## Python3

`# Python program to calculate ` `# the area of a rhombus ` `# whose one side and ` `# one diagonal is given ` ` ` `# function to calculate ` `# the area of the rhombus ` `def` `area(d1, a): ` ` ` ` ` `# Second diagonal ` ` ` `d2 ` `=` `(` `4` `*` `(a` `*` `*` `2` `) ` `-` `d1` `*` `*` `2` `)` `*` `*` `0.5` ` ` ` ` `# area of rhombus ` ` ` `area ` `=` `0.5` `*` `d1 ` `*` `d2 ` ` ` ` ` `# return the area ` ` ` `return` `(area) ` ` ` `# driver code ` `d ` `=` `7.07` `a ` `=` `5` `print` `(area(d, a)) ` |

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## C#

`// C# program to calculate the area of a rhombus ` `// whose one side and one diagonal is given ` `using` `System; ` ` ` `class` `GFG ` `{ ` ` ` ` ` `// function to calculate the area of the rhombus ` ` ` `static` `double` `area(` `double` `d1, ` `double` `a) ` ` ` `{ ` ` ` ` ` `// Second diagonal ` ` ` `double` `d2 = Math.Sqrt(4 * (a * a) - d1 * d1); ` ` ` ` ` `// area of rhombus ` ` ` `double` `area = 0.5 * d1 * d2; ` ` ` ` ` `// return the area ` ` ` `return` `area; ` ` ` `} ` ` ` ` ` `// Driver code ` ` ` `public` `static` `void` `Main (String []args) ` ` ` `{ ` ` ` `double` `d = 7.07; ` ` ` `double` `a = 5; ` ` ` `Console.WriteLine(area(d, a)); ` ` ` `} ` `} ` ` ` `// This code is contributed by Arnab Kundu ` |

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**Output:**

24.999998859949972

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