Referring to this figure what is the difference in the meaning between the notaions QR( with a line over it) and QR?
THE QR WITH THE LINE OVER IT REFERS TO A SEGMENT OF A LINE.
JUST QR IS REFERRING TO A SIDE USUALLY OF A SHAPE.
To understand the difference in meaning between the notations QR (with a line over it) and QR, we need to analyze the figures in detail. However, since you haven't provided any figure for reference, I'm unable to directly interpret the meaning.
In general mathematical context, when a line is placed over a symbol, it typically represents a real line segment or vector. Therefore, QR (with a line over it) would represent a line segment or vector named QR, whereas QR without a line over it might represent a point, a line, or some other mathematical entity related to QR.
To ascertain the exact meaning in the specific figure you are referring to, please provide more details or include the image for better assistance in analyzing the notation and providing a conclusive explanation.