The larger circle has a radius that is 18 inches longer than the smaller circle. The larger circle has a circumference that is A pi feet larger then the smaller circle. find the value of a.

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  1. Radius of smaller circle: a-18 (inchs)

    Radius of larger circle: a (inchs)

    Circumference of smaller circle:
    2*pi*(a-18)=2*pi*a-2*pi*18=2*pi*a-36*pi (inchs)

    Circumference of larger circle:
    2*pi*a (inchs)

    Difference betwen ircumference of smaller and large circle:

    36*pi (inchs)

    D=36*pi (inchs)

    1feet=12 inchs



    A*pi=3*pi Divide with pi


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  2. D=(36*pi)in=(3*pi)ft

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