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                     \ 10-Nov-2025  Bharat Arora   Proof-8                                    Reader’s Sign _______________________ Date __________

                                                                                                    21 st
                              Activity                                                             Century   #Experiential Learning
                                                                                                   Skills

                           •  Trace a circle using any circular object such as a big bottle cap or a bangle and
                               cut along the traced lines.
                               Cut a piece of string and wind it around the circle. Use a ruler to measure the
                               length of the string, which is equal to the length of the circle. The length of the
                               circle is called its circumference.

                           •  Now, fold the circle in half and make a crease. Open it out.
                               The crease makes a line across the circle which is called the
                               diameter of the circle.

                           •  Again,  fold the half  folded  circle
                               in half  as  shown. We  will get  a
                               quadrant.  Now  open  out  the  folds.                                              Diameter
                               We will see four quarters meeting at
                               a common point. This point is called
                               the centre of the circle.
                               The line segment  that  joins  a point
                               of the circle to the centre is called a
                               radius of the circle.
                           •  A half circle is called a semicircle.

                                                                                                      Centre        Radius

                    parts of a Circle

                    Look at the circle and its parts given below:

                                                                  Centre of the circle
                                                                  O is the centre.The distance between point O
                                                                  and any point on the boundary of the circle is equal.

                                                                  Diameter
                                                                  The diameter AB is the distance across a circle
                                      O                           through its centre.
                    A                                      B

                                                                  Radius
                                                                  The radius OR is the distance from the centre
                                                                  to any point on the circle.

                                              R                   Circumference
                                                                  The circumference is the distance around the circle.

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                                                                                                    Geometry

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