81.The radius and slant height of a cone are in the ratio 4 : 7. If its curved surface area is 792 cm2, find its height.
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82.The circumference of the base of a 24 m high solid wooden cone is 44 m. Find its curved surface area.
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83.How many metres of cloth wide will be required to make a conical tent whose base diameter is 10 m and whose vertical height is 12 cm?
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84.What length of canvas 3 m wide will be required to make a conical tent of height 8 m and radius of base 6 m? (Use = 3.14)
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85.A circus tent is in the form of a cone of height 15 m and diameter 16 m. Find the length of the canvas needed to make the tent if the width of the canvas is 2 m. (Use = 3.14)
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86.What is the radius and curved surface of a cone made from a quadrant of a circle of radius 28 cm?
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87.
Find the surface area of a sphere of radius:
(i) 10.5 cm (ii) 5.6 cm (iii) 14 cm.
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88.Find the surface area of a sphere of diameter:
14 cm
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89.Find the surface area of a sphere of diameter: 21 cm
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90.Find the surface area of a sphere of diameter: 3.5 m.
Short Answer Type
wide will be required to make a conical tent whose base diameter is 10 m and whose vertical height is 12 cm?
= 3.14)
= 3.14)
