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point
 has no shape or size
 ex. .A "point a"

line
 made up of points has no thickness
 ex.
 ______ <_______>
 Line RS Line RS Line M

collinear
points that lie on the same line

coplaner
points or lines that lie in the same plane

INTERSECTIONS
 two lines intersect at a point
 *two planes intersect at a line
 *a plane and a line intersect in a point

line segments
 part of a line detirmned by two end points
 ex. A______B = segment AB

congruement segments
have the same measure

RAY
 a part of a line . has ecxactly one endpoint and extends infinetly in one direction
 ex . rap mp

adjacent
next to each other

VERTICLE ANGLES
TWO adjacent angles formed by two intersecting liines

linear pair
a pair of adjacent angles whose uncommon sides are oppisite rays
also = to 180

complementary angles
two angles with measures that have a sum of 90 degrees

supplementary angles
two angles w measures that hav a sum of 180 degrees

perpindciular
intersect to form 4 right angles



perimeter
sum of all sides

