Maths-
General
Easy

Question

The C.S.A. and T.S.A. of cylinder are in the ratio 1:2. If the T.S.A of the right cylinder is 616 sq. cm, then find its volume?

hintHint:

CSA of a cylinder with base radius r and height  h  is 2 pi r h and TSA is 2 pi r left parenthesis r plus h right parenthesis.

The correct answer is: The volume of the cylinder is 1078 cm3.


    Explanations:
    Step 1 of 4:
    Given that CSA:TSA = 1:2
    not stretchy rightwards double arrow CSA colon 616 equals 1 colon 2
    not stretchy rightwards double arrow CSA equals 1 half cross times 616 equals 308 cm squared
    Step 2 of 4:
    Similarly, CSA:TSA = 1:2
    not stretchy rightwards double arrow fraction numerator 2 pi r h over denominator 2 pi r left parenthesis r plus h right parenthesis end fraction equals 1 half
    not stretchy rightwards double arrow 2 h equals r plus h
    not stretchy rightwards double arrow h equals r
    Step 3 of 4:
    We have, CSA = 308
    not stretchy rightwards double arrow 2 pi r h equals 308
    not stretchy rightwards double arrow 2 pi r squared equals 308 left parenthesis text  since  end text h equals r text  )  end text
    not stretchy rightwards double arrow r squared equals 308 cross times 7 over 22 cross times 1 half equals 49
    not stretchy rightwards double arrow r equals 7 cm discarding the negative value since distance cannot be negative
    Sinceh equals r  , then h equals 7 cm
    Step 4 of 4:
    Volume of the cylinder = pi r squared h equals 22 over 7 cross times 7 squared cross times 7 equals 1078 =  cm3
    Final Answer:
    The volume of the cylinder is 1078 cm3.

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