81.The area of a rhombus and that of a square are equal. The side of the square is 6 cm. If one of the diagonal of the rhombus is 4 cm, then find the length of its other diagonal.
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Short Answer Type
82.If the length, breadth and height of a cuboid are respectively equal to 6 cm, 4 cm and 7 cm, then find its total surface area.
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Long Answer Type
83.The edge of a cube is 2 cm. Find the total surface area of the cuboid formed by three such cubes joined edge to edge.
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Short Answer Type
84.A company is selling its suitcases according to their surface areas. A suitcase can be bought at the rate of Rs 0.05 per cm2. If the size of the suitcase purchased by Ramita is 80 cm × 48 cm × 24 cm, find the cost paid by Ramita for such 100 suitcases.
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85.A closed cylindrical tank of radius 7 cm and height 5 m is made from a sheet of metal. If the breadth of the rectangular sheet is 10 m, then find the length of the sheet.
86.A road roller makes 250 complete revolution to move once over to once level a road. Find the area of the road levelled if the diameter of the road roller is 84 cm and length is 1 m.
A road roller is a cylinder, such that Radius = Length (h) = 1m = 100 cm ∵ Lateral surface area of a cylinder = ∴ Lateral surface area of the road roller ∴ Area of road levelled in 1 revolution = 26400 cm2 Area of road levelled in 250 revolutions
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Short Answer Type
87.A cuboid is of dimensions 50 cm × 45 cm × 30 cm. How many small cubes with sides 5 cm can be places in the given cuboid?
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88.A square and a rectangle have same perimeter. If the side of the square is 60 cm and length of the rectangle is 80 m, then whose area is more and how much?
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89.Find the perimeter of a semicircular figure, if its diameter is 2.8 cm.
Long Answer Type
Short Answer Type
Area of road levelled in 250 revolutions
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