Conjecture

an unproved statement based on observations

Inductive Reasoning

a process for making conjectures

Counterexample

proves something is false

Point

has no dimension; represented by a dot

Line

extends in one dimension; represented with a line and arrows in both directions

Plane

extends in 2 dimensions; drawn as a box

Collinear Points

points that are on the same line

Coplanar Points

points that lie in the same plane

Line Segment

a portion of a line

Ray

has an initial point; extends in one direction

Initial Point

starting point of a ray

Intersect

geometric figures do this if they have one or more point in common

Intersection

points that geometric shapes have in common

Angle

 made of 2 rays with the same initial point

Sides

rays make up the ______ of an angle

Vertex

the initial point of an angle

Congruent Angles

angles that have the same measure

Acute Angle

angle less than 90 degrees

Right Angle

angle with measurement of 90 degrees

Obtuse Angle

an angle greater than 90 degrees and less than 180 degrees

Adjacent Angles

angles that have a common vertex and side

Midpoint

point that divides a segment in half

Bisects

Cuts something into 2 congruent pieces

Segment Bisector

Cuts a segment into 2 congruent pieces

Angle Bisector

divides an angle into 2 congruent pieces

Linear Pair

2 adjacent  angles that add to 180 degrees

Complementary Angles

two angles whose measures add to 90 degrees

Supplementary Angles

2 adjacent angles that add to 180 degrees