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Circles of radii 2, 2, 1 touch each othe...

Circles of radii `2, 2, 1` touch each other externally. If a circle of radius `r` touches all the three circles externally,then `r` is

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Knowledge Check

  • The circles having radii 1, 2, 3 touch cach other externally then the radius of the circle which cuts three circles orthogonally is

    A
    1
    B
    4
    C
    6
    D
    2

  • Three circles of radius a, b, c touch each other externally. The area of the triangle formed by joining their centre is

    A
    `sqrt((a+b + c)abc)`
    B
    `(a+b+c)sqrt(ab+bc + ca)`
    C
    `ab + bc + ca`
    D
    None of the above

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