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Q:

If the areas of circular ring having inner and outer radius 8 cm and 12 cm respectively is equal to the total surface area of cylinder of radius Rand height h, then h in terms of R1 will be :

  • 1
    $$ {40-R_1\over {R_1}}$$
  • 2
    $$ {40-R_1\over {R_1^{2}}}$$
  • 3
    $$ {40-R_1^{2}}\over R_1$$
  • 4
    None of these
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Answer : 3. "$$ {40-R_1^{2}}\over R_1$$"

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