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 R1 and height h, then h in terms of R1 will be :

If the areas of circular ring having inner and outer radius 8 cm and 1

1.	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 R1 and height h, then h in terms of R1 will be :
A.	$$ {40-R_1 over {R_1}}$$
B.	$$ {40-R_1 over {R_1^{2}}}$$
C.	$$ {40-R_1^{2}} over R_1$$
D.	None of these
Answer» D. None of these

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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 R1 and height h, then h in terms of R1 will be :

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