def square_area(side):
"""
Calculate area of a square from side length.
@param side: the side length
@return: the area (units^2 from side)
>>> square_area(4)
16
"""
if dim_validate(side):
return side*side
else:
raise ValueError("side is les than 0: "+str(side))
def square_perimeter(side: Number) -> Number:
"""
Calculate perimeter of a square from side length.
@param side: the side length
@return: the perimeter (same units as side length)
>>> square_perimeter(4)
16
"""
if dim_validate(side):
return 4*side
else:
raise ValueError("side is les than 0: "+str(side))
