A quadrilateral cannot have only three vertices.
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If it is a 2-dimensional figure then it is a quadrilateral. If it is a 3-dimensional figure then it is a tetrahedron.
A polygon is a closed figure bounded by sides only. Triangle is the polygon of 3 sides and 3 vertices.
A shape with four sides has four vertices and a shape with three sides has three vertices, so a shape with four sides has more vertices than a shape with three sides.
A nonagon has 9 sides, while a quadrilateral has 4 sides. Therefore, a nonagon has 5 more sides than a quadrilateral. The difference in the number of sides between a nonagon and a quadrilateral is calculated by subtracting the number of sides in the quadrilateral from the number of sides in the nonagon, which is 9 - 4 = 5.
Oh, dude, an equilateral triangle has 3 vertices, 3 faces (which are also the sides), and 3 edges. It's like the most balanced shape ever, so chill.