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232 • Chapter 7

                              2D Spatial Relationships
                              Look at the floor plan in Figure 7-5. Which of the other floor
                              plans is a rotation of it?



















                                    a                           b












                                    c

                                                           d











                              Figure 7-5    Floor plans


                                 The answer is letter b. To convince yourself, trace the
                              original plan (you might use the tissue paper that came in a
                              gift box), place it over each of the other plans, and rotate it
                              until it completely matches one of them. To match plan a, c,
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