# Area and Perimeter of a circle in PL/SQL

Prerequisite PL/SQL introduction
In PL/SQL code groups of commands are arranged within a block. A block group related declarations or statements. In declare part, we declare variables and between begin and end part, we perform the operations.

Given the radius of a circle and the task is to find the area and perimeter of the circle.
Examples:

```Input: 3
Output: Area = 28.26
Perimeter = 18.84

Input: 7
Output: Area = 153.86
Perimeter = 43.96
```

Formula for area and perimeter of circle:
Area:

`pi * radius * radius `

Perimeter:

`2 * pi * radius`

where pi = 3.14

Below is the required implementation:

 `--Find the area and perimeter of circle ` `DECLARE`  ` `  `    ``-- Variables to store area and perimeter ` `    ``area   NUMBER(6, 2)  ;   ` `    ``perimeter   NUMBER(6, 2)  ;  ` `     `  `    ``--Assigning the value of radius  ` `    ``radius NUMBER(1) := 3;  ` `     `  `    ``--Constant value of  PI  ` `    ``pi CONSTANT NUMBER(3, 2) := 3.14;  ` `     `  `BEGIN`  ` `  `        ``--Formula for area and perimeter of a circle  ` `        ``area := pi * radius * radius;  ` `        ``perimeter := 2 * pi * radius; ` `        ``dbms_output.Put_line(``'Area = '` `|| area);  ` `        ``dbms_output.Put_line(``' Perimeter = '` `|| perimeter);  ` ` `  `END``;  `

Output:

```Area = 28.26
Perimeter = 18.84
```
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