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# Chapter One

### Lines, Line Segment, Ray, Angles

TermDefinition
Line Segment measurable piece of a line with 2 distinct endpoints
Distance Formula the distance between two points A (x1,y1) and B (x2, y2)
Congruent having the same size AND the same shape
Congruent Segments If segments are congruent, they are also equal
Bisect to cut in half. A midpoint bisects a segment and gives 2 congruent parts
Midpoint Formula xm= x1 + x2/2 and y1 + y2/2. This gives the midpoint values when you are given two other points on a line segment
Ray a part of a line with exactly one endpoint. It goes indefinitely long in one direction. Remember in naming a ray that order matters!!
Angle 2 rays with a common end point.
Naming an Angle Always put the vertex in the middle of the angle name
Right Angle an angle which has a measure of 90 degrees
acute angle an angle which has a measure less than 90 degrees
obtuse angle an angle which has a measure more than 90 degrees
straight angle an angle which has a measure of 180 degrees
angle bisector a ray that divides an angle
Adjacent Angles adjacent angles are next to each other and share a ray.
Vertical Angles two non adjacent angles formed by 2 intersecting lines
Complementary Angles their measure add to be 90 degrees
Supplementary Angles their measure add to a total of 180 degrees
Perpendicular to prove something is perpendicular, you need to prove that it is 90 degrees.
Adjacent Supplementary Angles same as a linear pair.
Created by: amgeometry

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