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A cistern 6 m long and 4 m wide contains water up to a breadth of 1 m 25 cm. Find the total area of the wet surface.

  • 42 m sqaure
  • 49 m sqaure
  • 52 m sqaure
  • 64 m sqaure
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3. The volume of the largest right circular cone that can be cut out of a cube of edge 7 cm is:

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4. A cone of height 9 cm with diameter of its base 18 cm is carved out from a wooden solid sphere of radius 9 cm. The percentage of the wood wasted is :

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5. If a right circular cone of height 24 cm has a volume of 1232 cm cube, then the area of its curved surface is :

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Read more from - Volume and Surface Area Questions Answers
Post a comment

  • Ajay 11 years ago

    why we subtract lb from it

  • Admin 11 years ago

    Dear Sachin,

    As, we got,
    2[lb+bh+hl] - lb
    Open the bracket by multiplying by 2, we will get

    2lb + 2bh + 2hl - lb
    = 2bh + 2 hl + lb
    = 2 [bh + hl] + lb

    In this way we got it.

  • Sachin 11 years ago

    Can anyone please explain this formula step by step
    2[lb+bh+hl] - lb

    How did you got - lb

    2 [bh+hl] + lb

    How did you got + lb. Once the bracket are open, the sign should - not +

    Will really appreciate for your reply