Page 1 - Lesson Notes
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SAI International School


                                            Class :  VI


        Mathematics


        Chapter -4 – Basic Geometrical Ideas


        Lesson Note -3


        Subtopics:.

                    Angles and its parts
                     Triangles


                                    Definition                                 Example

        Angles                  An angle can be
                                  defined as the figure
                                  formed by two rays
                                  meeting at a
                                  common end point.
                                The two rays called
                                  the arms of the
                                  angle,
                                The common
                                  endpoint is called
                                  the vertex of the
                                  angle.
                                An angle is
                                  represented by the
                                  symbol ∠ .
                                The angle can be
                                  named as ∠AOB. Or
                                  ∠O in short.
                                Angles are
                                  measured in degree.









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