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If A=2pir, then r=...

If `A=2pir`, then r=_______

A

`2pi A`

B

`(2pi )/(A)`

C

`(2A)/( pi)`

D

`(A)/( 2pi)`

Text Solution

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The correct Answer is:
D
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Knowledge Check

  • If z_(r)=sin(2pir)/11-icos(2pir)/11, then sum_(r=0)^(10)z_(r) =

    A
    `-1`
    B
    0
    C
    i
    D
    `-i`

  • Assertion (A) : A solid iron in the form of a cuboid of dimensions 49 cm xx 33 cm xx 24 cm is melted to form a solid sphere. Then the radius of sphere will be 21 cm. Reason (R) : Volume of cylinder = pir^(2)h, r is the radius of the cylinder and h is the height of the cylinder.

    A
    Both A and R are true and R is the correct explanation of A.
    B
    Both A and R are true and R is not the correct explanation of A.
    C
    A is true but R is false
    D
    A is false but R is true

  • The number of auxiliary formulae that can be derived from P=(x)/(360^(@))(2pir) _______

    A
    1
    B
    2
    C
    3
    D
    4

    • Similar Questions

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    The area of a circle is given by A=pir^(2) , where r is the radius . Calculate the rate of increases of area w.r.t. radius.

    If P=pir+2r and P=36cm, then find the value of r (in cm).

    The specific resistance rho of a circular wire is given by rho= pir^(2)R//l . Given: radirs r = 0.20 pm 0.02 cm , resistance R= 25 +1 Omega , and length 1 = 5.00 pm 0.01 cm . The percentage error in rho is ______ %.

    In the expression 2pir , the algebraic variable is _______ .

    If the volume of a sphere is 4/3pir^3 where pi=22/7 and r is radius of the sphere, then the radius of the sphere of volume (704)/21m^3 is

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