Program to find the area of a Square

What is a square ? 
Square is a flat shape, in one plane, defined by four points at the four corners. A square has four sides all of equal length, and four corners, all right angles (90 degree angles). A square is a kind of rectangle but with all sides equal. 
 

👁 Image

Formula : 

Examples: 
 

Input : 4
Output :16

Input :8
Output :64

 

 

Output: 
 

16

Time complexity: O(1)

space complexity: O(1)
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