Big Ideas Math Integrated I, 2016
BI
Big Ideas Math Integrated I, 2016 View details
2. Measuring and Constructing Segments
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Exercise 1 Page 392

Where do the notations X and Y in XY come from?

See solution.

Practice makes perfect

In the given context, X and Y refer to points. When we write XY, we are describing the line segment that connects these two points. When we write XY, we are describing the length of this segment.