Final answer:
Arab dhows had two common characteristics: they were sailing vessels and originated from the Arabian Peninsula. Their triangular sails, known as lateen sails, enabled efficient movement in both downwind and upwind conditions.
Step-by-step explanation:
The various types of Arab dhows had two characteristics in common: they were all sailing vessels and they originated from the Arabian Peninsula. Dhows were traditionally used for trade and fishing in the Indian Ocean and Red Sea regions.
One significant characteristic of their sails was their triangular shape. These sails, known as lateen sails, allowed dhows to move efficiently in both downwind and upwind conditions. The triangular shape allowed for better maneuverability and control.
Learn more about Arab dhows and their characteristics