Answer:
In the lines 185-190, Odysseus lies to the Cyclops about his ship because he wants to protect his remaining crew and escape from the Cyclops. He tells the Cyclops that his ship has been destroyed by Poseidon, hoping that the Cyclops will believe him and not go after the ship to destroy it. If the Cyclops knew that the ship was still intact, he may have thrown boulders or done something else to cause damage or kill Odysseus and his men as they attempted to escape. Therefore, Odysseus uses his cleverness and quick thinking to protect himself and the remaining members of his crew.