What Have We Discussed ?

Perimeter is the distance covered along the boundary forming a closedopen figure when we go round the figure time(s).

Perimeter of a rectangle with length "m" and breadth "n" =

Perimeter of a square with side "s" =

Perimeter of an equilateral triangle with side "l" =

Figures in which all sides and angles are are called regular closed figures.

The amount of surface enclosed by a closed figure is called its .

To calculate the area of a figure using a squared paper, the following conventions are adopted:

(a) Ignore portions of the area that are than half a square.

(b) If more than half a square is in a region, count it as square.

(c) If exactly half the square is counted, take its area as sq units.

Area of a rectangle with length "m" and breadth "n" =

Area of a square with side "s" =