As performed in real lab:
Coloured paper, compass, scale, a pair of scissors, gum, colours
- Draw a circle of radius r = 4 cm (say) on the paper.
- Divide the circle into 16 equal parts. [Fig (a)]
- Cut all the 16 parts and arrange them to get the [Fig (b)].
- Take any part from any side and further divide it into 2 parts. [Fig (c)]
- To complete the shape of rectangle arrange these two smaller parts at the corners of the shape obtained in [Fig (b)].
- Find the length and the breadth of the rectangle so formed [Fig (d)].
- Find the area of the rectangle.
Fig (a) Fig (b)
Fig (c) Fig (d)
As performed in Simulator:
- Click on scale (between 2 and 3) in workbench to draw circle.
- Click on the circle to mark 16 sectorials parts & color them differently.
- Move mouse over each wedge to align them in a row.
- Click on next button below to color wedges & divide in two group.
- Click blue group to rotate and align.
- Drag the blue group and drop over green group to join and form parallelogram.
- Click on left most wedge to cut it into two parts.
- Drag the red part and attach to the right end so as to form a rectangle.
- This is a rectangle whose area can be calculated as (Length x Breadth).
- The students will observe that the area of rectangle
- The students will observe that the rectangle is obtained from parts of circle. Hence area of circle =