Let’s Begin Geometry Everyday Vocabulary!!!!

Words to live by……  Point  Line  Ray Shows location Connects points, goes in 2 directions forever Has a starting point, goes in 1 direction forever.

Words to live by  Line Segment Part of a line with a starting point and an end point.  Plane Must contain at least three non-collinear points.  Midpoint A point in the middle of a line segment, it divides the segment into 2 equal parts.

Words to live by  Bisector A line that divides an angle or line into 2 equal parts.  Congruent EQUAL EQUAL EQUAL  Co-linear On the same line  Co-planar On the same plane

Angles What is an angle?? One ray Two Rays Vertex The angle measure (degrees)

Words to live by…ANGLES  Acute Angle Greater than 0 and less than 90 degrees  Obtuse Angle Greater than 90 but less than 180 degrees  Right Angle 90 degrees exactly  Straight Angle 180 degrees exactly

Words to live by…ANGLES  Complementary Angles 2 or more angles whose measures add up to 90  Supplementary Angles 2 or more angles whose measures add up to 180  Linear Pair 2 angles whose measures add up to 180  Adjacent Two angles that share a ray…touching….

Naming Angles  It takes three (3) points to name an angle. A C B M< ACB M< BCA

A B D E F C

On your paper….  Create a 60 o angle  Create a 130 o angle  Create a 15 o angle  Draw three random angles, then measure them.

44 X Y Z V W

a X V W a+12

z Y V W 4x x

M N L 7m+29 5m-5

 1. What is the supplement of an angle whose measure is 68?  2. What is the complement of an angle whose measure is 68?

 1. What is the supplement of an angle whose measure is 133?  2. What is the complement of an angle whose measure is 133?

 1. What is the supplement of an angle whose measure is x?  2. What is the complement of an angle whose measure is x?

HOMEWORK!!!!  Workbook pg. DO NOT WRITE THE QUESTIONS!!!!