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.
it is an oblique straight oval.
A shape with eight straight sides is called on octagon. There is not another specific name, but you could call it the more generic name: polygon.
It's called a "polygon".
quadrilateral shape
If the sides are straight lines, then it is normally referred to as a 400-gon.
A prism.
It is a trapezoid. If the 2 nonparallel sides are congruent, then it is an isosceles trapezoid.
convex
sphere
a washer
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Pentagon
toroid
A decagon.
142 * * * * * What?! A hexagon is a polygon - a closed plane shape - which is bounded by six straight lines. The name comes from the Greek prefix hex- for six.
a cube or cuboid