Final answer:
To ensure that the door hangs properly, the door frame must have parallel top and bottom sides, a right angle between the top and right side, and parallel left and right sides.
Step-by-step explanation:
In the given case, a carpenter is framing an opening in a wall to hang a rectangular door. The door frame should have the following properties to ensure that the door hangs properly:
- The top and bottom are parallel. This is important for the door to ideally fit properly within the frame and prevent any gaps.
- The top and right sides form a right angle. This ensures that the door is properly aligned with the frame, allowing it to open and close smoothly.
- The left side and right side are parallel. This is necessary for the spcific door to hang straight and not be crooked within the frame.