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# Geometry Chapter 1

Postulate 1 Through any two points exists exactly one line
Postulate 2 If two lines intersect, then their intersection is exactly one point
Postulate 3 If two points lie in a plane then the line containing those points must also lie in that plane
Postulate 4 If two planes intersect, then their intersection is a line
Postulate 5 Through any non collinear points ther exists exactly one plane
Angle addition postulate m<ABD+m<DBC=m<ABC
Segment addition postulate PS+ST=PT
Distance formula d= sq rt of (x2-x1)sq + (y2-y1)sq
Midpoint formula (x1+x2/2 , y1+y2/2)
complementary sum is 90
Supplementary sum is 180
Created by: karissa_faith