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find the area of a circular ring formed by circumference of two cocentric circles whose radii are 11 and 4​

By Everleigh

find the area of a circular ring formed by circumference of two cocentric circles whose radii are 11 and 4​

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Everleigh

The slope of a line passes through A(2,3) is 3 .

(a) Check whether the point B(5,12) be in this line.

(b) Wh

Represent 0.2 3 7 in the form of p/q,where p and q are integers and q≠0.​

1 thought on “find the area of a circular ring formed by circumference of two cocentric circles whose radii are 11 and 4​”

  1. Answer:

    43.98 sq. cm

    Step-by-step explanation:

    Let the radii of the outer and inner circles be r

    2 and r

    1

    respectively; we have

    Area=πr

    2

    2

    −πr

    1

    2

    =π(r

    2

    2

    −r

    1

    2

    )

    =π(r

    2

    −r

    1

    )(r

    2

    +r

    1

    )

    =π(5.7−4.3)(5.7+4.3)=π×1.4×10 sq. cm

    =3.1416×14sq.cm.=43.98 sq. cm

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