Geometry

Front 1

Postulate 2.1

Back 1

through any 2 points there is exactly 1 line.

Front 2

Postulate 2.2

Back 2

through any 3 points not on the same line there is exactly one plane.

Front 3

Postulate 2.3

Back 3

a line contains at least 2 points

Front 4

Postulate 2.4

Back 4

a plane contains at least 3 points not on the same line.

Front 5

Postulate 2.5

Back 5

if 2 points lie in a plane then the entire line containing those points, lies in that plane

Front 6

Postulate 2.6

Back 6

if 2 lines intersect, then their intersection is exactly 1 point.

Front 7

Postulate 2.7

Back 7

if 2 planes intersect then their intersection is a line.

Front 8

Postulate 2.8

Back 8

on a ruler: A corresponds to zero, and B corresponds to a positive real number.

Front 9

Postulate 2.9

Back 9

if B is between A and C, then AB+CB=AB.

Front 10

Postulate 2.10

Back 10

given --> AB and a # R between 0 and 180, there is exactly 1 ray with endpoint A, extending on either side of --> AB, such that the measure of the angle formed is R.

Front 11

Postulate 2.11

Back 11

if R is interior of <PQS, then m<PQR+m<RQS=m<PQS.

Front 12

Theorom 2.1

Back 12

if M is the midpoint of -- AB, then --AM ~= --MB.

Front 13

Theorom 2.2

Back 13

congruence of segments is
Reflexive Property: -AB ~= -AB
Symmetric property: if -AB ~=
-CD, then -CD ~= -AB
Transitive Property: if -AB ~= -CD, and -CD ~= -EF,then
-AB ~= -EF.