A hexagonal pyramid.
It could be a pyramid shape
I need help with that too!
A polygon. E.g triangles , sqares ,pentagon .
a rectangular pyramid and a square pyramid
540 degrees. you figure it out by seeing how many triangles you can make in the polygon (without crossing lines), and, because triangles equal 180 degrees, you multiply 180 times how many triangles you can make.
Yes, because the number of triangles that are formed in a polygon is 2 less than the numbers of its sides.