How to draw a graph by rotating 90 degrees around a point outside the graph

As shown in the figure, if you want to rotate the quadrilateral ABCD 90 ° around point O to get a new quadrilateral ABCD, the method is as follows: connect Ao, then make a straight line OA from point O, & nbsp; and make ∠ AOA 90 ° as required (if the rotation direction is required, the rotation direction should also be consistent. In the figure, the counterclockwise direction is shown), OA = OA; connect Bo, and then

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