How to draw the self-compensation of four points

1. Given four points A, B, C and D, choose a central point, which can be anywhere. Suppose point o is selected as the center point.

2. Mirror point A with respect to the central point O to obtain point A ... that is, by taking a point on the extension line connecting point A and point O as a.

3. Mirror points B, C and D with respect to the central point O to obtain points B, C and D respectively, and connect the four points A, B, C and D to form a quadrilateral.

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