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lf D is thedaneter of the brger circle ...

lf D is thedaneter of the brger circle and d the diameter of the small circle then `D+d=?`

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Knowledge Check

  • The radli of two concentric circles are 13 cm and 8 cm. AB is a diameter of the bigger circle and BD is a tangent to the smaller circle touching it at D and the bigger circle at E. Point A is joined to D. The length of AD is

    A
    20 cm
    B
    19 cm
    C
    18 cm
    D
    17 cm

  • The radii of two concentric circle are 13 cm and 8 cm. AB is a diameter of the bigger circle and BD is a tangent to the smaller circle touching it at D and the bigger circle at E. Point A is joined to D. Find the length of AD.

    A
    20 cm
    B
    19 cm
    C
    18 cm
    D
    17 cm

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