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'.
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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.
Polygons can't have curved sides so the answer is not a polygon.
Right angle, obtuse angle, acute angle, supplementary angle, complementary angle, interior angle, exterior angle, adjacent angle