Mensuration

Perimeter is the distance covered along the boundary forming a closed figure when one goes around the figure once. Figures in which all sides and angles are equal are called regular closed figures. Perimeter of rectangle is equal to the sum of the length of its four sides. Perimeter of a rectangle = 2 x (length + breadth) The perimeter of a square is four times the length of its side. Perimeter of a square = 4 x length of a side The perimeter of an equilateral triangle is three times the length of its side. Perimeter of an equilateral triangle = 3 x length of a side The perimeter of regular shapes is equal to the number of side multiplied by the length of a side. Perimeter of regular shapes = n x length of a side The amount of surface enclosed by a closed figure is called its Area. To calculate the area of a closed shape using a squared paper, following conventions are used: Area of portion covering full square = 1 sq. unit. Area of portion covering more than half square = 1 sq. unit. Area of portion covering half square = 1/2 sq. units. Area of portion covering less than half square = 0. The area of a rectangle is the product of its length and breadth. Area of Rectangle = l x b The area of a square is the square of its side. Area of Square = (side)2

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