Download Chapter 6- Geometry

Chapter 6- Geometry
Geometry Review!
** You will need a protractor for this chapter!!**
Intersecting lines and line segments:
1. Opposite Angles- A pair of equal angles formed by two intersecting
lines. Angles a and c are opposite angles, and angles b and d are
opposite angles:
a
d
b
c
2. Supplementary angles- two angles that add up to 180o.
o
3. Complementary angles- Two angles that add up to 90 .
50o
45o
Parallel Lines:
When a line intersects parallel lines, the angles formed have special
relationships:
1. Alternate Interior Angles ( Z pattern): page 259
E
A
F
G
C
H
AFG=
FGD
BFG=
CGF
B
D
130o
45o
2. Corresponding Angles( F Pattern): page 259
E
A
F
B
G
C
D
H
AFE =
CGF
AFG =
CGH
BFE =
DGF
HDG =
GFB
3. Supplementary Interior Angles (C Pattern):
E
A
F
G
C
H
AFG +
CGF = 180o
DGF +
BFG = 180o
B
D
Transformations:
1. Translation- a slide (see page 260)
2. Reflection- a flip (see page 260)
3. Rotation- a turn (see page 260)
Dilatation, Scale, Scale Factor and Proportion:
1. Dilatation- an enlargement or reduction.
2. Scale- the size of a figure or drawing in relation to the original
object. A scale diagram is an accurate drawing that is either an
enlargement or a reduction of an actual object.
diagram measurement
image measurement
Scale 
or Scale 
actual measurement
pre  image measurement
3. Scale factor- a ratio or number that represents the amount by which
a figure is either enlarged or reduced.
4. proportions- a statement that says two ratios are equal . that can be
used to determine measurements in scale drawings.
x 1

Ex Page 261.
32 4
x
1
 (32)
(32)
32 4
32
x
4
x 8
Homework!! Page 258 #1,2,3
Page 259#4,5
Page 260# 6,7,8
Page 261#9,10