diamond according to my calculations
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A plane shape with four vertices (corners). Usually the same as a quadrilateral, but can also include the shape formed by an X with two sets of opposite ends joined together.
irregular shape! :D x x x x x x x x x x x x
A sheet of A4 paper could be classed as a plane 2D shape, as it has length x width. A shoebox is an example of a 3D shape, as it has length x width x depth.
An oval is simply two circles joined at the sides by straight edges. From your x/y comments (moved to discussion) I would assume what you're trying to draw is an ellipse, which the link below describes (it also shows an oval).
The answer is 5!, 5 factorial. This equals 5 X 4 X 3 X 2 X 1, which is 120.