How do I know which is horizontal and which is vertical?

Horizontal and vertical are two different directions that can be used to describe the orientation of an object. Horizontal is defined as being parallel to the horizon or parallel to the ground, whereas vertical is defined as being perpendicular to the horizon or perpendicular to the ground. To determine which direction is horizontal and which is vertical, you must first determine the orientation of the object in question.

For example, if you are looking at a wall, the wall is either horizontal or vertical depending on the orientation of the wall. If the wall is parallel to the ground, then it is horizontal. If the wall is perpendicular to the ground, then it is vertical. Similarly, if you are looking at a table, the table is either horizontal or vertical depending on the orientation of the table. If the table is parallel to the ground, then it is horizontal. If the table is perpendicular to the ground, then it is vertical.

In addition, you can also determine the orientation of an object by looking at the angle of the object. If the angle of the object is 0 degrees, then it is horizontal. If the angle of the object is 90 degrees, then it is vertical.

Finally, you can also determine the orientation of an object by looking at its shape. If the shape is flat and wide, then it is horizontal. If the shape is tall and narrow, then it is vertical.