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LINE
contains at least 2 points

PLANE
contains at least 3 noncollinear points

SPACE
contains at least 4 noncoplanar points

POSTULATE 6
through any 2 points there is exactly 1 line

POSTULATE 7
 through any 3 points there is at least 1 plane
 through any 3 noncollinear points there is exactly 1 plane

POSTULATE 8
if 2 points are in a plane, then the line that contains the points is in that plane

THEOREMS:
 If 2 lines intersect, then they intersect in exactly one point
 Through a line and a pont not on the line, there is exactly one plane
 If two lines intersect, then exactly one plane contains the lines

"RULER POSTULATE"
segments can be measured

"SEGMENT ADDITION POSTULATE"
If B is between A and C, then AB+BC=AC

"PROTRACTOR POSTULATE"
angles can be measured

"ANGLE ADDITION POSTULATE"
if point B lies in the interior of angle AOC, then m∠AOC+m∠BOC=m∠AOC.

POSTULATE
statement always accepted as true

THEOREM
an important statement that is proved

