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11 m**Introduction**

**Various units of measurement of area.**

**Area and perimeters of various plane.**

**The cost of turfing a rectangular field at 85 paise per square metre is Rs 624.75. Find the perimeter of the field if its sides are in the ratio 5 : 3.**

**The base of a parallelogram is thrice its height . If the area is 867 `cm^2` find the base and height of the parallelogram.**

**Find the area of a rhombus having each side equal to 13 cm and one of whose diagonals is 24 cm.**

**An ant is moving around a few food pieces of different shapes scattered on the floor. For which food-piece would the ant have to take a longer round? Remember, circumference of a circle can be obtained by using the expression `c=2pir,` where r is the radius of the circle.
**

**Base each of the two parallel sides of a trapezium is called a base of the trapezium.**

**Height or altitude the distance between the two bases (parallel sides ) is called the height or altitude of the trapezium.**

**Area of trapezium ABCD.**