Using a square dot sheet or a graph sheet draw a rectangle and construct a similar figure.

Find the perimeter and areas of both and compare their ratios with the ratio of their corresponding sides.

Perimeter = 2(l + b)

= 2(2 + 1)

= 2(3)

= 6 cm

Area = l×b

= 2×1

=

A figure similar to above figure is shown below:

Perimeter =

=

=

= 12 cm

Area =

=

=

Ratio of the sides of the two figures (fig 2:fig 1) = 2:1

Ratio of the areas of the two figures (fig 2:fig 1) = 3:1

Ratio of the perimeter of the two figures (fig 2:fig 1) = 2:1