# Arc Length of Cycloid

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A polygon rolls on a line . The positions of a vertex when has a side flush with form a polygonal path (orange). The orange segments are the base sides of green isosceles triangles. When you drag the "combine" slider, the green triangles combine to form a right triangle with height , the diameter of incircle of the polygon. Hence, the length of the orange path is the sum of the height and the hypotenuse of this triangle.

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Contributed by: Okay Arik (March 2011)

Open content licensed under CC BY-NC-SA

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