Chapter 1: Geometry Notation- Anderson

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length of a segment

MN=12 How far from M to N

acute angle

less than 90 degrees

perpendicular

lines, rays, segments, or planes that intersect and make right angles

parallel

lines, rays, segments, or planes that never intersect when extended forever (in algebra they have the same slope)

straight angle

180 degrees

obtuse angle

more than 90 degrees less than 180 degrees

angle addition posturate

part+part=whole

non-coplanar

points or lines that could NOT lie on the same plane

coplanar

points or lines that could lie on the same plane

non-collinear

points that could NOT have a line drawn through them.

collinear

points that could all lie on the same line

right angle

90 degrees

plane

a flat surface that goes on forever and contains points, lines, and rays

point

a location in space

midpoint

a point that divides a segment into two congruent segments

supplementary

angles that add up to 180 degrees

complementary

angles that add up to 90 degrees

congruent angles

angles that have the same measure. It is shown by having tick marks through the angle to show congruency

segment bisector

another name for a midpoint

congruent

equal

measure of an angle

how much an angle opens up (measured in degrees)

segment addition posturate

if 3 points (ABC) are collinear and B is in between A and C then AB+BC=AC

congruent segments

segments that have the same measure or length. shown by using tick marks. a segment with one tick mark is equal to another segment with only one tick mark

ray

straight path that goes forever in one direction. it has on end point

line

straight path that goes forever in two directions

line segment

straight path that has 2 end points

angle

the interior space when two rays, lines or segments intersect. the point where they intersect is the vertex.

vertical angles

they are across from each other and share the same line. these angles are always congruent

adjacent angles

two angles that share the same side

opposite rays

two rays that make a line/straight angle


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