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The area enclosed between the concentric...

The area enclosed between the concentric circles is `770\ c m^2` . If the radius of the outer circle is 21 cm, find the radius of the inner circle.

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The area enclosed between two concentric circles is 770 cm^(2) .If the radii of the circles differ by 7 cm ,find both the radii.

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Knowledge Check

  • The difference in the areas of two concentric circles is 66 cm^2 and the radius of the outer circle is 11 cm. What is the radius of the inner circle?

    A
    8 cm
    B
    9 cm
    C
    10 cm
    D
    7 cm

  • The difference between the areas of two concentric circles is 88" cm"^(2) If the radius of the inner circle is 6 cm. then the area ("in cm"^(2)) of the larger circle is closest to: ("Take "pi=(22)/(7))

    A
    196
    B
    201
    C
    197
    D
    198

  • The area of a ring is 16.94 cm^(2) and the area of the outer circle is 55.44 cm^(2) .Find the perimeter of the inner circle .

    A
    22 cm
    B
    `26.4` cm
    C
    `38.5` cm
    D
    `29.04` cm

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    Area enclosed by two concentric circles

    The area enclosed by the circumference of two concentric circles is 423.5 cm^(2) . If the circumference of outer circle is 132 cm. Calculate the radius of the inner circle

    The circumference of the circle is 31.4cm. Find the radius and area of the circle

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