A cone
5 edges, 5 verts, and faces are only on 3d shapes, for the most part, so any 2d shape has 1
The order of rotational symmetry of a 2D arrowhead shape is 1. This means that the shape can only be rotated about its center by 360 degrees to look the same, as it does not match its original position at any smaller angle. In other words, there are no other angles of rotation (like 90 or 180 degrees) that will make the arrowhead appear unchanged.
A major sector of a curve.
It could be a kite or an irregular quadrdilateral with one right angle - which would not have any specific name.
It can have none, 1 or 2.
A sphere.
It cannot be a polyhedron nor any "normal" 3d shape.
a 2d shape can only ever contain 1 face!
A shape with one corner is a triangle. Yes, I know, technically it has three sides, but it only has one corner. So, there you have it, a triangle is the shape you're looking for.
I think they all have 1.... because 2d shapes are flat!!! :)
A cone
Regular polygon with any number of sides, circle, ellipse, isosceles triangle, rectangle, isosceles trapezium, kite, arrowhead.
triangle
1 rectangle and 2 circle.
1
Almost any 2D/3D shape has more than one vertex. Triangles, squares, rectangles etc. etc.