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Does the edge in the "observation object" of mathematics in the third grade of primary school refer to the left or the right?
In engineering drawing, there are six complete views.

(front view), back view, top view, bottom view,

And the right point of view.

The side view refers to

And the right point of view.

According to the three-dimensional principle, one of the front and back views, the top and bottom views, and the left and right views is selected.

, can fully express the three-dimensional space.

Traditionally, people often choose

, top view and

These three views probably conform to people's visual habits.

I hope this answer is helpful to your study.