• 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:
  1. Count full squares, half squares and more than a half of squares covered by the figure.
  2. Area covered by a full square and more than half of a square is counted as one square unit.
  3. Area covered by half of a square is counted as 1/2 sq. unit.
  4. Portions that are less than half of a square are ignored.

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