area of a curcle using two functions

circle-area.py

#!/usr/bin/python
# encoding: utf-8
"""
calculate the area of a circle using two functions
"""
__author__ = 'Ernest'
import math


def radius(x1, x2, y1, y2):
    """

    :param x1: x-position 1
    :param x2: x-position 2
    :param y1: y-position 1
    :param y2: y-position 2
    :return: distance between two points
    """
    deltax = (x2 - x1)**2
    # print deltax
    deltay = (y2 - y1)**2
    # print deltay
    distance = math.sqrt(deltax + deltay)
    # print 'radius', distance
    return distance

def area(xc, xp, yc, yp):
    """

    :param xc:
    :param xp:
    :param yc:
    :param yp:
    :return:
    """
    circle_area = math.pi * radius(xc, xp, yc, yp)**2
    # print circle_area
    return circle_area

print area(1, 4, 2, 6)