Page 1 - Activity 3 Opposite angles of Cyclic Quadrilateral Ch.10 Circle
P. 1

SAI International Residential School
                                                       CLASS - IX

               Mathematics

               ACTIVITY-1
               Chapter 10: Circles


               Sub Topic:  Verify that the Opposite Angles of a Cyclic Quadrilateral
               are Supplementary


                                                       OBJECTIVE


               To verify that the opposite angles of a cyclic quadrilateral are supplementary.


               Materials Required


                 1.  Cardboard
                 2.  White paper
                 3.  Drawing sheet
                 4.  Geometry box
                 5.  Scissors
                 6.  Sketch pens
                 7.  Adhesive
                 8.  Transparent sheet

               Prerequisite Knowledge


                 1.  Knowledge about the supplementary angles, linear pair axiom and interior opposite
                    angles.
                 2.  All the basic information related to cyclic quadrilateral.


               Theory


                 1.  Two angles are said to be supplementary, if the sum of their measures is 180°. In
                    the figure given below, ∠BOC and ∠AOC are supplementary angles, (see Fig.
   1   2   3   4   5