A triangle has to have straight sides
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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 three straight edges in a triangle.
Not all triangles have to be straight.
An arc has no straight sides because its part of the circumference of a circle
A three-sided shape with one curved side is known as a "curvilinear triangle." This shape consists of two straight sides and one curved side, creating a triangle-like form with a rounded edge. It can be used in various mathematical and design contexts, where a blend of linear and curved geometry is required.