All geometric figures.
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A term that is undefined mean simply that it is not defined. The prefix un means not, and if you add it to the word defined, ta da, you get undefined.
the "building blocks" of geometry(which are the point,line and plane)are so-called undefined because, technically,they can't be described without the aid of words which are undefined themselves.
the "building blocks" of geometry(which are the point,line and plane)are so-called undefined because, technically,they can't be described without the aid of words which are undefined themselves.
"Defined items" are defined in terms of "undefined terms".
The three undefined terms are the point,the line and the plane.
The answer depends on which undefined terms the question refers to.
"Defined items" are defined in terms of "undefined terms".
Yes. Even though those terms are left undefined, they are used together with ordinary words to define other geometric terms.
Points, lines and planes are precisely defined terms. These concepts have to be clearly delineated to form fundamental planks in geometry, and that's because as they do. In suggesting that they are undefined, we'd have to suspect everything that was built on them. No geometric figure could be discussed with any certainty unless the elements that make it up are clearly defined and understood.
A geometric shape that has 11 sides is called a "hendecagon" or "undecagon." Both terms are acceptable.