All you have to do to make a right angle out of a piece of string is put the string in the shape of an L. This will make a right angle
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No, a segment is a piece of a line. However, two segments that intersect at a point make an angle. In fact, the segments that make up the angle are called the sides of the angle.
No.
Angle abc will form a right angle if and only if, segment ab is perpendicular to segment bc.
Right triangles have two acute angles, but that doesn't make them right. Having a right angle makes them right.
A 45 degree elbow will not make a right angle, but two will, if connected in line so that they continue the turn in the same direction. (45o + 45o = 90o, a right angle.)