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POSTULATES
1. Two Points Determine a Line
Through any two points there is
exactly one line. (p. 14)
2. Three Points Determine a Plane
Through any three points not on a
line there is exactly one plane. (p. 14)
3. Intersection of Two Lines
If two lines intersect, then their
intersection is a point. (p. 22)
4. Intersection of Two Planes
If two planes intersect, then their
intersection is a line. (p. 22)
5. Segment Addition Postulate
If Point B is between Point A and
Point C, then AC = AB + BC. If
AC = AB + BC, then Point B is
between Point A and Point C.
6. Angle Addition Postulate
If Point P is in the interior of <RST,
then the measure of <RST is the sum
of the measures of <RSP and < PST.
(p. 37)
7. Linear Pair Postulate
If two angles form a linear pair, then
they are supplementary. (p. 75)
8. Corresponding Angle Postulate
If two parallel lines are cut by a
transversal, then corresponding angles
are congruent. (p. 128)
9. Corresponding Angles Converse
If two lines are cut by a transversal so
that corresponding angles are
congruent, then the lines are parallel.
10. Parallel Postulate
If there is a line and a point not on the
line, then there is exactly one line
through the point parallel to the given
line. (p. 144)
11. Perpendicular Postulate
If there is a line and a point not on the
line, then there is exactly one line
through the point perpendicular to the
given line. (p. 144)
12. Side-Side-Side Congruence
Postulate (SSS)
If three sides of one triangle are
congruent to three sides of a second
triangle, then the two triangles are
congruent. (p. 241)
13. Side-Angle-Side Congruence
Postulate (SAS)
If two sides and the included angle of
one triangle are congruent to two
sides and one angle of a second
triangle, then the two triangles are
congruent. (p. 242)
14. Angle-Side-Angle Congruence
Postulate (ASA)
If two angels and the included side of
one triangle are congruent to two
angles and the included side of a
second triangle, then the two triangles
are congruent. (p. 250)
15. Angle-Angle Similarity Postulate
(AA)
If two angles of one triangle are
congruent to two angles of another
triangle, then the two triangles are
similar. (p. 372)
16. Arc Addition Postulate
The measure of an arc formed by two
adjacent arcs is the sum of the
measures of the two arcs. (p. 602)