A circle or an oval (ellipse)
This depends on what one calls a "side". Usually a side needs to be straight, as in the case of polygons.
A semicircle is one shape fitting this description.
circle
a sphere has no bases and it only has one curved surface
An arc (segment of a circle) has one straight side, and one curved side.
A circle has one curved line and it is its circumference
If you have only one curved side, you could be a semi-circle or a crescent shape.
A semicircle is one shape fitting this description.
there are 2 faces on a hemisphere the round side and the flat side
circle
A lens is a piece of glass or other hard clear material molded with either one side flat and the other curved, or both sides curved. The curving side/s are to refract or bend light.
There is one curved side and two curved edges (the rims along the top and bottom).
a semi circle.. (:
If you are referring to a shape, then a semi-circle would be the most likely shape that contains one straight side and one curved. Take a look at a protractor, it's a semi-circle.
A two-dimensional shape with one curved side and four straight sides can be created, but there is not 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.
A hemisphere has no edges. It has one curved surface that smoothly transitions from the curved side to its base.
a sphere has no bases and it only has one curved surface