__author__ = 'emmanuel'
print("Hello People")
print("A Fly in a Cup of Tea")
print("Hello Ghana")
print("Hello Ghana")
print("some changes")
print("change further but bot working here")


from numbers import Number
from numpy import *

def square_perimeter(side : Number) -> Number:
    """
    calculate perimeter of a square from side length.
    @param side: the side length
    12
    """
    return 4*side
print (square_perimeter(3))


    @return: the parameter (same unit as the length)
    >>> square_perimeter(3)
def circle_area(radius : Number) -> Number:
    """
    calculate the area of a circle from radius
    @param radius: the circle's radius
    @return: the parameter (same unit as the radius)
    >>> circle_area(7)
    154
    """
    return pi*radius*radius
print (circle_area(7))