A two-dimensional shape with six sides is a hexagon.
A three-dimensional object with six square faces is a hexahedron.
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That would be a hexagon, if on a flat plane.
Six sides on a 3-dimensional object could be either a square cube or a rectangular cube.
The most common six sided object is a cube (the six sides of a cube can be described as the front, the back, the left side, the right side, the top, and the bottom), although there are many other possible ways to get six sides.
That would be a pentagon.
A straight edge
An arc (segment of a circle) has one straight side, and one curved side.
'Object' Do you mean 'shape' or 'solid'. a 2-dimensional shape is an hexagon a 3-dimensional solid is a hexahedron.