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The Reuleaux triangle, also known as the Leloir triangle, the Lelou triangle, or the arc triangle, is a special type of triangle. It refers to a triangle whose three sides are regular triangles respectively.The vertex is the center of the circle, draw an arc with its side length as the radius. The curved-edge triangle formed by these three arcs is called the Reuleaux triangle. The characteristics of the Reuleaux triangle are that it has the same width in any direction, that is, it can freely rotate between two parallel lines with a distance equal to its arc radius a