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Mathematical modeling of solid geometry
Method 1

Prepare some sticks and ropes, make an incomprehensible figure, and make an understandable model.

Method 2

Draw more graphics, imagine the rotation of graphics as much as possible, and pay more attention to the relationship (intersection, angle, etc. Geometric elements in the graph of).

Method 3

Use some software that can draw three-dimensional graphics on the computer to help you understand.