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    E:\Working\Orange_Education\TouchPad_Maths_4\Open_Files\Chap_10\Chap_10
                 \ 10-Nov-2025  Bharat Arora   Proof-8                                     Reader’s Sign _______________________ Date __________

                               Picture drawn by Nupur                      Picture drawn by Nikhil
                                           6 cm                                       12 cm

                                                                        8 cm                              8 cm
                                    10 cm              10 cm

                                                                                      12 cm

                                          6 cm
                    1.  Length of ribbon required for the picture drawn by Nupur

                           = _____ cm + _____ cm + _____ cm + _____ cm = _____ cm

                  2.  Length of ribbon required for the picture drawn by Nikhil
                           = _____ cm + _____ cm + _____ cm + _____ cm = _____ cm

                  3.  They need to buy _____ cm ribbon in all to decorate the pictures.

                Perimeter

                Ankit  goes for a  walk every
                morning. He wants to go around
                a region in the park, so he starts
                walking from a tree. When he

                returns to the same tree, he
                would  have walked along the
                entire path around the region.
                The  length of the whole path,

                shown by  the  dotted  line,  is  the
                perimeter of the  region around
                which Ankit walks.

                Perimeter of a Polygon

                We know that the distance around the boundary of a figure is its perimeter.
                The perimeter of a closed figure bounded by line segments (called a polygon) can be
                found using square grid paper. If the sides of a polygon lie on the grids of the squared

                paper, the lengths of the sides of the polygon can be found simply by counting the
                number of squares. Each square on the grid is 1 unit length.

                       170       Mathematics 4

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