def __create_bootstrap(self, main_root):
		bootstrap_dir = os.path.join(main_root, 'bootstrap')
		safe_mkdir(bootstrap_dir)

		bootstrap = self.__config_mgr.bootstrap()
		self.__bootstrap_mgr.create_bootstrap(bootstrap, bootstrap_dir)
def getAp2(self):
        ret =math.acos(((self.getLenp1() * self.getLenp1() + self.getLenp3() * self.getLenp3()) - self.getLenp2() * self.getLenp2()) / (2* self.getLenp1() * self.getLenp3()))
        return ret