Geometry Chapter 1 Vocabulary

Point

a dot that tells the exact point of where soemthing is

Line

which has length but no width and extends infinitely in both directions

Plane

is a flat surface that extends into infinity

Ray

a part of a line that has a fixed starting point but no endpoint.

Segment

The portion of a line between any two of its points

Opposite Rays

two rays that have the same endpoint and extend in opposite directions

Collinear

if they lie on the same line

Angle

are formed when two lines intersect at a point

Midpoint

a point that is exactly in the middle of the line segment joining two point

Bisector (angle and segment)

Parallel

Perpendicular

Inductive Reasoning

Conjecture

Counter example

Conditional

Converse

Inverse

Contrapositive

Negation

Biconditional

Adjacent Angles

vertical Angles

Complementary

Supplementary

Linear Pair

Postulate

statement that is assumed to be true