Chapter 1 Postulates/Theorems

Question 1

1.1 Ruler Postulate (p. 12)

Answer 1

The points on a line can be matched one to one with
the real numbers. The real number that corresponds to a
point is the coordinate of the point. The distance between points A and B, written as AB, is the absolute value of the difference of the coordinates of A and B.

Question 2

1.2 Segment Addition Postulate (p.14)

Answer 2

If B is between A and C, then
AB + BC = AC.
If AB + BC = AC, then B is between A and C.