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Chapter – 11, Mensuration, , Perimeter: Length of boundary of a simple closed figure., Perimeter of:, Rectangle = 2(l + b), Square = 4a, Parallelogram = 2(sum of two adjacent sides), Area: The measure of region enclosed in a simple closed figure., Area of a trapezium = half of the sum of the lengths of parallel sides × perpendicular, distance between them., Area of a rhombus = half the product of its diagonals., Triangle =, , x base x height, , Diagonal of:, Rectangle =, Square =, Surface area of a solid is the sum of the areas of its faces., Surface area of:, , a cuboid = 2(lb + bh + hl), , a cube = 6l2

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a cylinder =, , (r + h), , Amount of region occupied by a solid is called its volume., Volume of, a cuboid = l x b x h, a cube = l3, a cylinder =, , r 2h, , (i) 1 cm3 = 1 ml, (ii) 1L = 1000 cm3, (iii) 1 m3 = 1000000 cm3 = 1000L