Circle
mobius strip
A line.
pentadecahedron
Decagon
dodecagon
An octagon.
There is no specific name for such a shape.
A shape with three linear sides and one curved side can be drawn, but such a shape has no specific name.
Nonagon, or enneagon.
Irregular shape is the term given to an object which has 1 flat side, 1 curved side, no corners but has curved edges.
A semicircle.
A Scalene Triangle
its called a heptagon
i believe it is a pentagon