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When two lines


                              meet with each

                              other                                                                                                              turn in the

                                                                                                                                                 opposite

                                                                                                                                                 direction of the

                                                                                                                                                 hands on a clock



                                                                                                                                        Quarter turn                  Half   turn

                                                                                                                                     a quarter of a               half turn is the

                                                                                                                                      full turn                  equivalent of
                                                                                                                                     (360 degrees)                turning through two
                                                                                   Quarter turn                 Half   turn
                                                                                                                                                                 right angles.

                                                                                                                                            Three-quarter turn

                                                                                                                                          Three-quarters turn is

                                                                                                                                          the equivalent of turning

                                                                                                                                          through 1/3 right angles.
                                                                                 Three-quarter turn
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