MENSURATION - ESSENTIAL POINTS
- Perimeter of n sided regular figure = n × (Length of one side)
- Perimeter of a rectangle = 2 × (length + breadth)
- Perimeter of a square = 4 × length of its side
- Perimeter of an equilateral triangle = 3 × length of a side
Area is the amount of region enclosed by a plane closed figure.
- Area of a rectangle = length × breadth
- Area of a square = side × side
While calculating the area of irregular figures, following steps are to followed:
- Count full squares, half squares and more than a half of squares covered by the figure.
- Area covered by a full square and more than half of a square is counted as one square unit.
- Area covered by half of a square is counted as 1/2 sq. unit.
- Portions that are less than half of a square are ignored.
