Triangles
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2-dimensional shapes, with three straight sides have three vertices.
triangles
Triangles have 3 sides.
There two different shapes that have more than one vertex. One is a triangle it is a plane figure that has three straight sides and three angles and a quadrilateral which a four sided figure.
Yes * * * * * Not true! A circle is a 2-d shape that is not a polygon. A polygon must have sides that are straight lines. A 2-d shape need not have straight sides.