The words are Latin based, and the words tell us a lot about what the figures are. Triangles literally means "three angles" and there are indeed three angles in a triangle. A quadralateral means "four equal sides" and polygon means "many sides figure". So the many sided figure that has four equal sides might be a parallelogram, it might be a square, or a rectangle. The polygon merely says it's a shape. Get the picture? These are actually word pictures.
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The triangle is a polygon with 3 sides. The polygon is a closed planar geometric shape made of line segments connected end to end to end. All triangles are polygons, but not all polygons are triangles. There are many variations on the theme when it comes to a polygon. There are many, many different kinds.
Polygons.Polygons.Polygons.Polygons.
No it cant. Polygons must have straight sides. The sides also can't cross each other.
A triangular prism has 5 sides: two triangles at either end and three rectangles joining the triangles.
There are 2 with 1 at each end