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

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