A shape with three linear sides and one curved side can be drawn, but such a shape has no specific name.
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Yes, a shape can have three straight sides and one curved side. This type of shape is known as a triangle with one curved side, which is also called a curved triangle or a curved-sided triangle. The curved side can be a segment of a circle or any other curved shape, while the other three sides are straight lines.
no because a quadrilateral has straight sides if it were curved it wouldn't be a polygon because polygons must have straight sides
There is no specific name for such a shape.
A semi-circle is actually a specific type of shape known as a "regular" shape. A regular shape is one that has all sides and angles equal. In the case of a semi-circle, it has a curved side and a straight side, but the curved side is a perfectly round half-circle, making it a regular shape. Irregular shapes, on the other hand, do not have sides or angles that are equal.
A circle is non-polygon. Meaning it has a curved side. A circle has no sides. It is non-regular.