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Pentagon
The triangle has.
A square pyramid has 5 vertices. A triangular prism has 6 vertices. The pyramid has -1 more vertex than the prism, or 1 fewer.
A polygon may have many more than four sides, a triangle has only three vertices.
Then you have 6 vertices. No problem.
A triangle has fewer than 4 vertices.
Pentagon
No, a polygon can have fewer lines of symmetry.
The triangle has.
There are many shapes that have fewer than 3 vertices like the circle, hyperbola, semi circle, and many others. However if you are only talking about polygons then there is no actual shape with fewer than 3 vertices that you can find in a real life situation but they do have names for these shapes. A 2-sided polygon is known as a digon. A 1-sided polygon is known as a monogon. These shapes only exist in theory however and not in real life.
What polygon has 2 fewer sides than an decagon
A square pyramid has 5 vertices. A triangular prism has 6 vertices. The pyramid has -1 more vertex than the prism, or 1 fewer.
A polygon may have many more than four sides, a triangle has only three vertices.
It has 2 fewer sides than a pentagon
decagon
Then you have 6 vertices. No problem.
No.