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A point
A point has zero dimensions; a line has only one direction, which is length. Two-dimensional objects have length and width, and therefore area.
0. A triangle is a 2-dimensional object and so its volume - which requires a 3-dimensional object - is always zero.
A point zero dimensional can exist in a to dimensional plane because it occupies the zero point in both dimensions.
On a three dimensional basis yes it can. Fir instance, if an object is moving directly towards or away from you the angular displacement can be zero though the distance displacement changes.
A point
A zero-dimensional object cannot move along any dimension, so it (and everything else in this dimension) appears as one incredibly tiny speck. A point is zero-dimensional. A one-dimensional object is a step up from a zero-dimensional one, since objects can move in only in one direction, and objects appear along an impossibly narrow line. These include the line, ray, and segment.
A point has zero dimensions; a line has only one direction, which is length. Two-dimensional objects have length and width, and therefore area.
Points are the only such objects.
0. A triangle is a 2-dimensional object and so its volume - which requires a 3-dimensional object - is always zero.
One-dimensions objects
An ellipse is a 2-dimensional object and so its volume must be zero!
A square is a 2-dimensional shape whereas volume is a property of a 3-dimensional object. So it makes no sense to talk about a square having volume. However, a 2-dimensional shape can also be considered as a 3-dimensional object with either a zero or infinite third dimension; so the volume of a square can be considered as either zero or infinite.
A circle being a two dimensional object has zero length in the third dimension so its volume is always zero.
Negligible, though not exactly zero.
A point zero dimensional can exist in a to dimensional plane because it occupies the zero point in both dimensions.
Nanoparticles and quantum dots are the zero dimensional structures.