area.py

#!/usr/bin/python
# encoding: utf-8
"""
Description calculate the area of a circle
"""
import math

def distance (x1, y1, x2, y2):
    dx = x2 - x1
    dy = y2 - y1
    dsquared = dx**2 + dy**2
    result = math.sqrt(dsquared)
    return result

def circle_area(x1, y1, x2, y2):
    radius = distance(x1, y1, x2, y2):
    result = area(radius)
    return result