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What is the circumference of a circle with a radius of 9 cm?

    ##=56.52cm##

    The formula for the circumference of a circle is ##=2 pi r##

    The radius ##=9 cm##

    circumference ##=2 pi r##

    ##=2 xx 3.14 xx 9##

    ##=6.28 xx 9##

    ##=56.52cm##

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