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A two dimensional figure exists on a single plane whereas a 3d figure exists in space. a 2d figure is always a 3d figure but the converse need not to be true.
for example a circle can exist in one plane as well as in space. but a cube always exists in space and not on a plane.
The plane is in two dimensional and the space figure is in three dimensional.
pallelogram is more of aa slanted figure than a rectangle. a squre is more of lines that are equel and a rectangle and pallellagram have diffrent lines
venn diagram
I've been doing a little bit of research on this and i think the main difference between the two is that an estimator is function/formula/a process of calculations that give you an estimate( which is a final figure that expresses and is meant to equal a figure i.e population mean but does not actually equal it due to various errors in the given data/sample)
A nought figure is not needed in the Roman numeral system because the positional place value of these numerals are self evident. A nought figure is needed in the Arabic numeral system (the numbers we use today) to identify the positional place value of these numerals.