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    E:\Working\Orange_Education\TouchPad_Maths_4\Open_Files\Chap_07\Chap_07
                     \ 10-Nov-2025  Bharat Arora   Proof-8                                    Reader’s Sign _______________________ Date __________

                    Example 2. Look at the given circles and find the missing measure.

                                                        A                                             H
                                                   3 cm

                                 a.   B        O           C                  b.   E          O    ?      F
                                                ?
                                                                                             8 cm

                    Solution.  a.  Radius (OA) = 3 cm

                                     Diameter (BC) = 2 × OA = 2 × 3 cm = 6 cm
                                 b.  Radius (OH) = ?

                                     Diameter (EF) = 8 cm                                                     The radius
                                                                                                              is half the
                                              2 × OH = 8 cm                                                  length of the
                                                                                                               diameter.
                                                  OH = 8 cm ÷ 2 = 4 cm

                                Exercise 7E

                        1.  look at the given circle. Name its following parts:                               E
                           a.  Centre         _________                   b.    Radius      _________                      G

                           c.  Diameter       _________                                                           O

                                                                                                                        F
                       2.  Which of the line segments shown                3.  Which of the line segments shown
                           in this circle is its radius?                        in this circle is its diameter?
                                                 A                                            C

                                            O      B                                     A         O       B

                                                  C                                           D          P
                       4.  draw circles of radius:

                           a.  5 cm                 b.  4 cm                 c.  6 cm                  d.  3 cm

                      5.  find the radius of these objects.

                           a.                                b.                               c.

                                    Diameter = 6 cm                  Diameter = 20 cm                 Diameter = 14 cm

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                                                                                                    Geometry

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