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A triangle has to have straight sides
A triangle with a curved bottom is often referred to as a "triangular arc" or a "curvilinear triangle." This shape combines the characteristics of a triangle with a curved edge, deviating from the traditional straight-line sides. In some contexts, it may also be described as a "rounded triangle."
there are no curves in a triangle
Reuleaux triangle
A triangle - any triangle - has 3 sides.