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False. They can only be straight line segments: there cannot be any curved line segments.
You cannot have a shape without any line segments.
Two segments cannot form a triangle.
According to Mohs' Hardness Scale, talc registers at a 1, whilst feldspar registers at a 6, so, no, talc cannot scratch feldspar.
you cannot only updated versions can be used as default
Cannot be found even in large registers of artists.
False
First, lines and rays cannot be congruent because they do not have both end points defined. Not having an end point define means we cannot talk about their length so they can't be congruent. Line segments, however, can be congruent. Congruent line segments NEED NOT be parallel.Furthermore, if two line segments are parallel, that does not mean they are congruent since parallel line segments may not have the same length.Congruent line segments would be ones that are the same length.
Pair of radii
You cannot delete it, it's a default on myspace.
As one cannot join what does not exist, no. You would have to be associated to quit, and since you cannot be associated, you cannot quit. Sort of a cart an horse thing.
The main disadvantages are:They are not very easy to read with more than 7 segments,They are difficult to read if some segments are very small (on bar charts you could use a log scale),Small differences between segments are not easy to spot,Segments cannot have negative values.