[color=#000000][br][/color][color=#000000]वर्तुळ म्हटले म्हणजे त्याचे भाग आपणास व त्याचे गुणधर्म,[br]व व्याख्या माहित असणे आवश्यक आहे या भागात आपण वर्तुळाची त्रिज्या, व्यास ,जिवा स्पर्शिका,[br]छेदिका ची माहिती करून घेणार आहोत. तसेच या कृतीच्या साह्याने आपण त्यांच्या व्याख्या[br]व गुणधर्म स्पष्ट करणार आहोत.[/color][br][color=#000000][br][br][/color]

[br][br][b]13-.1 Introduction : [/b][br][br][br]                    Study of circle play very important[br]role in the study of geometry as well as in real life. Path traced by[br]satellite, preparing wheels of vehicle, gears of machines, rings, drawing[br]designs etc. Many mathematics concepts get cleared and  understands with the study of circle. It[br]influences the mathematics that is taught and enhances students learning.[br][br][br] [br][br][br][b]13.2. Observe and Explore. (Step – 1)[/b][br][br][br][b]Task – 1.[/b]      Different shapes of video.                                 ( Time – 5[br]Min.)[br][br][br]                    The aims of showing this video is to[br]create interest of the student. by showing different shapes, teachers will ask[br]the questions to the students.[br][br][br] [br][br][br][b]Activities – 1. [/b][br][br][br]1.        Students you have seen different figures[br]in video. Can you tell me what is the shape of the last figure which you have[br]seen?[br][br][br]2.        Teacher will ask so many questions on[br]video clips and involve students in ‘’guided discussion’’ that lead to concept[br]of circle.[br][br][br] [br][br][br][b]Activities – 2. Video clipe [/b][br][br][br]                    Teacher will take students on the play[br]ground and do the activities as shown in video clips. At the end teacher will[br]ask the questions leading to the previous knowledge.[br][br][br][b]Teacher        :         [/b] What did you find in this clip?[br][br][br][b]Pushkar       :[/b]         Sir, I had seen wheel of cycle, car,[br]auto riskshaw, bullock [br][br][br]cart.[br][br][br][b]Teacher        :[/b]         How[br]was their shape?[br][br][br][b]Pushkar       :[/b]         Sir,[br]their shape are circuler.[br][br][br][b]Teacher        :[/b]         What[br]you have seen in the ring of cycle?[br][br][br][b]Pushkar       :[/b]         I[br]had seen spokes.[br][br][br][b]Teacher        :[/b]         All[br]the spokes are of equal length?[br][br][br][b]Minu            :[/b]         Yes[br]sir, All the spokes are of equal length.[br][br][br][b]Teacher        :[/b]         Equal[br]length is called radius and mid point is called centre [br][br][br]of the[br]circle.[br][br][br][b]Minu            :[/b]         Does[br]It mean that all the radius of the circle are equal?[br][br][br][b]Teacher        :[/b]         Yes,[br]Absolutely right.[br][br][br][b]Rudraksh     :[/b]         If I will join two spokes. Will it be[br]the diameter? or chord [br][br][br]of the[br]circle?[br][br][br][b]Teacher        :[/b]         Yes,[br]the chord passing through the centre of the circle is [br][br][br]called[br]diameter.[br][br][br][b]Minu            :[/b]         It[br]means that diameter is doubled than the radius?[br][br][br][b]Pushkar       :         [/b]No sir, I say that the radius is half of the diameter.[br][br][br][b]Teacher        :[/b]         Don’t[br]argue. Both of you are correct.[br][br][br](Teacher[br]will explain circle after all discussion)[br][br][br]