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Title: CalcQieDian3 Download
 Description: Three points A, B, C (coordinates Ax, Ay ......) A, B is rectangular and the two end points of C with AB parallel to the edge of another rectangle or its extension line of the other two end points for the rectangular M, N re-seek with the MN angle of 45 degrees, and M a distance of 10 points, P and MN angle 45 degrees, and N a distance of 10-point Q Note: P, Q are inside the rectangular
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