Page 98 - Maths Skill - 6
P. 98

96                                                                                                  Maths


                                                INTEGRATED QUESTION

        The map shows the area and roads around a school.

        Use this map to answer the following questions:                     Road-1

          (i)  Colour all roads that are parallel to Abu lane with black colour.     Road- 4

          (ii)  Mark 3-obtuse angles with level O , O , O .                                 School       Road-5  Road-3
                                               1
                                                      3
                                                   2
         (iii)  Find the name of that road which is perpendicular to road-2.  Road-2
         (iv)  How many right angles are in this map.
                                                                                 Abu Lane
          (v)  Mark 6-acute angles with level a, b, c, d, e, f.


             Word Stock
          Magnitude       Parallel        Perpendicular      Close           Figure        Interior     Exterior

          Sector          Concentric      Minor              Major           Circular      Altitude



                Activity

        Making  a  Protractor



                            1.   Cut out a circular shape using a bangle or take a circular sheet of
                              about the same size.


                            2.   Fold it twice to get a shape as shown. This is called a quadrant.


                            3.   Open it out. You will find a semi-circle with a fold in the middle.
                              Mark 90° on the fold.


                            4.   Fold the semicircle to reach the quadrant. Now fold the quadrant
                              once more as shown. The angle is half of 90° i.e. 45°.


                            5.   Open it out now. Two folds appear on each side. What is the angle
                              upto the first new line? Write 45° on the first fold to the left of the
                              base line.


                            6.  The fold on the other side would be 90° + 45° = 135°


                            7.   Fold the paper again upto 45° (half of the quadrant). Now make
                              half of this. The first fold to the left of the base line now is half of
                              45° i.e. 22½°. The angle on the left of 135° would be 157½°.

                          You have got a ready device to measure angles. This is an approximate
                          protractor.
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