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Learning by Doing

Objective: Understand the concept of the circumference of a circle.
Materials Required: Cardboard, a scissor, a marker, a ruler
Procedure:
• Make cutouts of circular shapes of different radii from the cardboard.

• Take a cutout and mark a point on the edge of the cutout.

• Place the card on a table with the marked point of the card touching the table. Mark the
position of the point on the table.

• Roll the circular card on the table along a straight line till the marked point of the card
again touches the table.

• Measure the distance between the points along a line by a ruler. This distance is the
circumference of the circular card.

Circumference

• Similarly find the circumference of other circular cards.

305 Perimeter and Area