Find the area of a rectangle when provided with one diagonal and one side of the rectangle. If the input diagonal is less than or equal to the length of the side, return "Not a rectangle". If the resultant area has decimals round it to two places.
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import math

def area ( diagonal, side ):
    if diagonal <= side: return 'Not a rectangle'
    
    return round(math.sqrt(diagonal ** 2 - side ** 2) * side, 2)
import math

def area ( diagonal, side ):
    if diagonal <= side: return 'Not a rectangle'
    
    return round(math.sqrt(diagonal ** 2 - side ** 2) * side, 2)