import math

def distance(x1, y1, x2, y2):
    dx = x2 - x1
    dy = y2 - y1
    result = math.hypot(dx, dy)
    return result
    
def area(r):
    return math.pi * r**2

def area2(xc, yc, xp, yp):
    radius = distance(xc, yc, xp, yp)
    result = area(radius)
    return result