It has no special meaning.
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no it has no sides that are the same * * * * * In mathematics, the word "normal" is used to mean perpendicular (or at right angles). In that context, a scalene triangle will be a normal, or right angled triangle if its angles are (90, A and 90-A) degrees where 0<A<90. If by "normal" you mean "ordinary" or "nothing special about it" then the answer is yes.
it is a mathematics source and is hard to explain
pascal triangle
The answer depends on what you mean by "mean of triangle". There is no such geometric term.
If you mean "triangle", a triangle can never have two parallel sides.If you mean "triangle", a triangle can never have two parallel sides.If you mean "triangle", a triangle can never have two parallel sides.If you mean "triangle", a triangle can never have two parallel sides.