from math import sqrt

class Line(object):

    def __init__(self,coor1,coor2):
        self.coor1 = coor1
        self.coor2 = coor2

    def distance(self):
        return sqrt((self.coor2[1] - self.coor1[1])**2 + (self.coor2[0] - self.coor1[0])**2)

    def slope(self):
        return (self.coor2[1] - self.coor1[1]) / (self.coor2[0] - self.coor1[0])

coordinate1 = (5, 6)
coordinate2 = (10, 11)

li = Line(coordinate1, coordinate2)

print("The line distance is:", li.distance())
print("The line's gradient is:", li.slope())

class Cylinder(object):

    pi = 3.14

    def __init__(self, height = 1, radius = 1):
        self.height = height
        self.radius = radius

    def volume(self):
        return Cylinder.pi * self.radius**2 * self.height

    def surface_area(self):
        return 2 * Cylinder.pi * self.radius * self.height + 2 * Cylinder.pi * self.radius**2

c = Cylinder(5, 6)

print("The volume is:", c.volume())
print("The area is:", c.surface_area())