Volume And Surface Area
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11 If the volume of a cube is 729 cu cm, what is the length of it's diagonal?
12 A copper wire of length 36 m and diameter 2 mm is melted to form a sphere. The radius of the sphere (in cm) is :
13 The capacities of two hemispherical vessels are 6.4 litres and 21.6 litres. The areas of inner curved surfaces of the vessels will be in the ratio of :
14 The base of a pyramid is an equilateral triangle of side 1 m. If the height of the pyramid is 4 metres, then the volume is :
15 Find the curved surface area (in cm2) of a right circular cylinder of diameter 14 cm and height 8 cm.
16 The volume of a cube is numerically equal to sum of it's edges. What is the total surface area in square unit's?
17 Three cubes of sides 1 cm, 6 cm and 8 cm are melted to form a new cube. Find half of the surface area of the new cube:
18 The capacity of a cuboid tank of water is 50000 L. Find the breadth of the tank, if it's length and depth are 2.5 m and 10 m, respectively: