1. Lesson 1-R
Chapter Review

2. Objectives
Review chapter

3. Vocabulary
none new

4. Visual Definitions k Points A, B, C, D Line k Collinear A, B, Cy
A, B, C, D
Line k
(-5,5) k
(6,4) D C
Collinear
(0,1)
A, B, C x A
Line Segments
(-6,-2)
BA, BC, AC B
Plane
xy coordinate
Coplanar
A, B, C, D

5. Precision
Precision – ½ the smallest unit of measure on the measuring device 1 2 3 4
40°F
50°F
60°F
70°F
Smallest Unit of Measure = 1/8 th inch
Precision = (1/8)/2 = 1/16 th inch
String Length is 2 ¼ ± 1/16 or
between 2 3/16 and 2 5/16 inches long
Smallest Unit of Measure = 2°F
Precision = (2°F)/2 = 1°F
Temperature is 60°F ± 1°F or
between 59°F and 61°F

6. Whole = Sum of its Parts
Any distance can be broken into pieces and the sum of those pieces is equal to the whole distance 11 14 6 A B C D 32
The whole length, AD, is equal to the sum of its parts, AB + BC + CD
AD = AB + BC + CD
32 =

7. Distance and Mid-points Review
Concept
Formula
Examples
Mid point
Nr line
Coord Plane
(a + b) 2
(2 + 8) 2
[x2+x1] , [y2+y1]
7 + 1 ,
Distance
D = | a – b |
D = | 2 – 8| = 6
D = (x2-x1)2 + (y2-y1)2
D = (7-1)2 + (4-2)2 = 40
= 5
= (4, 3)
(1,2)
(7,4) Y X ∆x ∆y D a b 1 2 3 4 5 6 7 8 9

8. Interior of angle AVB or V
Angles
360º A
Circle
Exterior of angle
Ray VA
Interior of angle AVB or V
Vertex (point V) V
Ray VB B
Angles measured in degrees
A degree is 1/360th around a circle
Acute
Right
Obtuse A A A
mA < 90º
mA = 90º
90º < mA < 180º
Names of angles: Angles have 3 letter names (letter on one side, letter of the vertex, letter on the other side) like AVB or if there is no confusion, like in most triangles, then an angle can be called by its vertex, V

9. Vocabulary Number of Sides Polygon Name 3 Triangle 4 Quadrilateral 5
Pentagon 6
Hexagon 7
Heptagon 8
Octagon 9
Nonagon 10
Decagon 12
Dodecagon n
N-gon
Linear pair – a pair of adjacent angles whose noncommon sides are opposite rays (always supplementary)
Vertical angles – two non adjacent angles formed by two intersecting lines
Vertical angles are congruent (measures are equal)!!
Complementary Angles – two angles whose measures sum to 90°
Supplementary Angles – two angles whose measures sum to 180°
Perpendicular – two lines or rays are perpendicular if the angle (s) formed measure 90°

10. Summary & Homework
Summary:
xxxx
Homework:
study for the test