Draw a diameter horizontally, The curved line consists of 2 semicircles, each with diameter r.

So, the curved line has length equal to the circumference of a circle with diameter r.

Thus, the length is 2πr.

Tim D.

asked • 11dIf the radius of the circle is r , what is the length of the curved line in the interior of the circle that separates the white region from the dark region?

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Draw a diameter horizontally, The curved line consists of 2 semicircles, each with diameter r.

So, the curved line has length equal to the circumference of a circle with diameter r.

Thus, the length is 2πr.

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