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Mathematical oblique drawing
The title does not require the position of this diamond in the coordinate system. We can take its center as the origin of the coordinate, and the four vertices are on the coordinate axis respectively.

Draw a coordinate system first. According to the three-dimensional space drawing method, the included angle between the Y axis and the X axis is 45 degrees, and the unit length on the Y axis is equivalent to √ 2/2 ≈ 0.7 on the X axis. .

2. Take points B (-2 √ 3,0) and D (2 √ 3,0) on the X axis and points A (0,2) and C (0 0,2) on the Y axis;

Third, connect AB, BC, CD and DA in turn, then the quadrilateral ABCD is the demand.