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SAI InternationalSchool
                                                       CLASS - IX

               Mathematics
               CHAPTER-6: LINES AND ANGLES

                Worksheet-1


               SUBTOPIC: BASIC TERMS AND DEFINITIONS

               1.    For what value of x + y in figure will ABC be a line? Justify your answer.             1











                     Ans.
                     For ABC to be a line, the sum of the two adjacent angles must be 180° i. e.
                     x + y = 180°.


               2.    An angle is euqal to five times its supplement. Find the measure of the angle.         1

                             0
                     Ans: 150

               3.    In the figure, POQ is a line. The value of x is                                        1









                     (a)20°              (b)25°            (c)30°               (d) 35°
                     Ans.(a)20°

               4.    Find the supplementary angle of  123 45 17  .                                          1
                                                                    ′′
                                                                ′
                                                             0
                                      ′′
                              0
                     Ans: 156 14 43
                                  ′
               5.    Find the angle which is equal to its complement.                                       1
                     Ans: 45
                             0

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