A Trapezoid.
when you cut a pentagon in half you create a trapizoid
triangle
hexagon
A pentagon does have reflective symmetry.
Two trapezoid
22.5 degrees half of 45
For a regular pentagon, draw a segment from each vertex to the midpoint of the side length directly opposite, there by cutting it in half.
If the two halves are identical then the line is a line of symmetry and is also a bisector.
It was named after a pentagon, it wasn't the 'Pentagon' that named the 'pentagon'.
Hexagon * * * * * A pentagon
The bottom half of Singapores flag is white, and the top half is red. On the top half there is a moon '(' and right next to the moon on the right are five stars in a 'pentagon' shape.
They are both the same. Pentagon is just a shorter way of saying the pentagon building. As for if you meant the shape pentagon, it is called the pentagon because it's shape is a pentagon.