Попадание точки в окружность

import math
data = input("Введите X,Y,R ")
m_data = data.split(" ")
print(m_data)
x = float(m_data[0])
y = float(m_data[1])
r = float(m_data[2])
upper_right = [math.ceil(x+r), math.ceil(y+r)]
lower_left = [math.ceil(x-r), math.ceil(y-r)]
print(upper_right)
print(lower_left)
m_coordinates = []
counter = 0
xy = []
i = 1
step = math.ceil(r)*2+1
for i in range(abs(int(lower_left[1])-int(upper_right[1]))+1):
    for j in range(abs(int(lower_left[0]) - int(upper_right[0])) + 1):
        point = [math.ceil(x-r)+j, math.ceil(y-r)+i]
        m_coordinates.append(point)
    print(m_coordinates[i*step:i*step+step])
for num in range(len(m_coordinates)):
    x_num = int(m_coordinates[num][0])
    y_num = int(m_coordinates[num][1])
    if (((x_num-x)**2) + ((y_num-y)**2)) <= (r**2):
        counter = counter + 1
print(counter)