import math


def polar2cart(radius, xCoordinate, yCoordinate, polarAngle):
    """Changes polar coordinates to cartesian coordinate system.
    :param radius: Radius
    :param xCoordinate: x coordinate of the origin
    :param yCoordinate: y coordinate of the origin
    :param polarAngle: Angle
    :return: Cartesian coordinates
    :rtype: tuple (int, int)
    """
    xCartesian = int(xCoordinate + radius * math.cos(polarAngle))
    yCartesian = int(yCoordinate + radius * math.sin(polarAngle))
    return xCartesian, yCartesian