hexagon, heptagon, octagon, nonagon, decagon, undecagon, dodecagon .... etc
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A nonagon has nine sides and a pentagon has five, so four more sides....
Because shapes with parallel sides are weak. Triangular sides are more stable - which is why the steel infrastructure in buildings and bridges etc usually have triangular cross-members to add strength to the structure.
a hexagon * * * * * or any one of infinitely many polygons with 5 or more sides; any one of an infinite number of polyhedra with more than 4 faces, as well as other shapes that do not fit into these classifications: for example, a closed plane shape with five curved sides which meet pairwise.
Acute triangles. They can have three angles, all less than 90 degrees (total is 180 degrees).Shapes with more than three sides must have angles of 90 degrees or more because the total of their angles must be 360 degrees (quadrilaterals) or more.
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.