Reuleaux triangle

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Reuleaux triangle

[‚re‚lō ′trī‚aŋ·gəl]
(mathematics)
A closed plane curve, not actually a triangle, that consists of three arcs, each of which joins two vertices of an equilateral triangle and is part of a circle centered at the remaining vertex.
References in periodicals archive ?
The 50p piece issued in 1969 was the first coin in the world to be struck in the shape of an equilateral curve heptagon.