Area

71 The area of a circle is 220 cm°. The area of a square inscribed in this circle will be

72 The areas of the largest circle, that can be drawn inside a rectangle with sides 18 cm and 14 cm, is

73 A square is inscribed in a circle whose radius is 4 cm. The areas of the portion between the circle and the square is

74 The length of a rectangular plot is 20 metres more than it's breadth. If the cost of fencing the plot at ₹ 26.50/m is ₹ 5300, what is the length of plot in metres?

75 The area of a sector of a circle of radius, 5 cm, formed by an arc of length 3.5 cm, is

76 A wire bent in the form of a circle of radius 42 cm is bent in the form of a rectangle whose sides are in the ratio of 6 : 5. The smaller side of the rectangle is

77 What will be the cost of gardening 1-metre broad boundary around a rectangular plot having perimeter of 340 metres at the rate of ₹ 10 per square metre?

78 A took 15 seconds to cross a rectangular field diagonally walking at the rate of 52 m/min and B took the same time to cross the same field along it's sides walking at the rate of 68 m/min. The area of the field is

79 The ratio of bases of two triangles is×: y and that of their areas is o : b. Then the ratio of their corresponding altitudes will be

80 The diagonal of a square is 4V2 cm. The diagonal of another square whose area is double that of the first square is