Chapter 1 Vocab Quiz Flashcards
Point
Represented by a small dot.
Line
Made up of points. Runs infinitely in both directions.
Plane
A flat surface that contain several points. It also runs infinitely in all directions
Collinear
Multiple points that are contained in the same line
Coplanar
Multiple places that are contained in the same plane
Intersecting
Two or more geometric figures intersect if they have one or more points in common
Postulate
A statement that is accepted without proof
Parallel
Lines that do not intersect, or in the same plane, and face in the same direction
Skew
Lines that do not intersect, are in different planes, and also face different directions
Segment
A part of a line. It contains two and points and connect them
Ruler Postulate
Subtract the end point values and take the absolute value of the difference
Point Between
A point is between two other points only if all three points are collinear (The point does not have to be the midpoint)
Segment Addition Postulate
If B is between A and C, then AB + BC = AC
Aka “lil seg” + “lil seg” = “big seg”
Congruent
Geometric terms that have the same value (equal)
Distance Formula
(Square root of ( x2-x1)^2 + (y2-y1)^2)
Midpoint
The point that divides a segment into two congruent segments
Midpoint Formula
COM = (x1+ x2/2 ), (y1+y2/2)
Segment Bisector
 Can be either a segment, ray, line, or plane that intersects a segment at its midpoint, splitting it into two congruent segments
Ray
A part of a line that starts at one endpoint and extends infinitely in the other direction
Opposite Rays
Raise going in opposite directions from the same starting point
Angle
Is formed by two different rays coming from the same start point
Sides of an angle
Rays that make up the angle
Vertex
The point the rays in the angle have in common
Interior point
A point that is located somewhere between the rays of an angle
Exterior point
A point that is located somewhere outside of the rays of an angle 
Angle bisector
A ray that divides an angle into two congruent angles
Angle Addition Postulate
“Lil angle” + “lil angle” = “big angle”
Adjacent angles
Angles that share a common side (middle) and vertex
Linear pair
Two adjacent angles that form a straight line
Vertical angles
A pair of angles formed by two intersecting lines. They are directly across from one another
Make an X shape 
Complementary angles
Pair of angles that sum to 90 degrees
supplementary angles
A pair of angles that sum to 180 degrees
Vertical angles are ____
Congruent
Two angles in a linear pair are _____
Supplementary
Perpendicular
Line segment or rays that form right angles
Theorem
Hey statement which must be proven true
Congruent supplements theorem
Look for two pairs of angles that add up to 180, with one of the angles being repeated. The angles that are different are the ones that are congruent
Congruent complement theorem
Look for two pairs of angles that add up to 90, with one of the angles being repeated. The angles that are different are the ones that are congruent
