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Possibly you mean a 'right angle', which is 90 degrees, like the inside corner of a square. I have never heard of a 'stright angle'.
In what sense? - i dont know, put them in a triangle, in a z-shape, a stright line, a "U" shape...
A pentagon has 5 straight edges.
It means that the speed of the object is constant.
There are an infinite number. The simplest is a pentagon, with five sides.