from sympy import *

class semicircle:
    def __init__(self,x,y,r,upper=False):
        if upper:
            self.coef = 1
        else:
            self.coef = -1

    self.x = x
    self.y = y
    self.r = r
    self.expr = simplify(self.y + self.coef * sqrt(r**2 -

class circle:
    def __init__(self,x,y,r):
        self.x = x
        self.y = y
        self.r = r