Geometry, Segment Addition Postulate

1. TRY IT OUT! SEE HOW MANY YOU CAN GET!
For questions 1-10, classify the each statement as
true or false.
1. 퐴퐵 and k are intersecting lines.
2. A, R, and T are collinear.
3. 푋푌 is the intersection of planes P and Q.
4. A, B, S, and Y are coplanar.
5. Plane P contains k.
6. T, S, and B are coplanar.
7. 퐴퐵 intersects plane Q at S.
8. A, R, S and T are noncoplanar.
9. 푅푆 and 푋푌 name the same line.
10. A, R, and B are collinear.

2. ANSWERS
1. False
2. False
3. True
4. True
5. False
6. True
7. False
8. True
9. True
10. True
 If you missed any, go
back and see if you can
figure out why.

3. POSTULATES (ALSO KNOWN AS AXIOMS)
 Statements that are
accepted without
proof.
 You will need to learn
the postulates as we
go.
 I recommend writing
them on cards and
keep them where you
can review them each
day.
 Every word in
postulates and
theorems is important.
Leaving one out or
changing it can
sometimes change the
meaning.
 Certain postulates and
theorems you will need
to memorize. I will let
you know which ones
those are as we go.

4. POSTULATES 1-1 AND 1-2

5. POSTULATES 1-3 AND 1-4

6. THE RULER POSTULATE
KNOW HOW TO USE IT!

7. SEGMENT ADDITION POSTULATE**
MEMORIZE IT!
 (We will use this postulate over 1000 times
this year.)
 This is in the real number system where we
can “add” numbers, since we cannot “add”
objects.