## With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

No credit card required

CHAPTER 1
You’ve got Chapter 1 under your
techniques for finding missing
angles to your toolbox. For a complete
list of tool tips in the book, visit
A square mark indicates a
RIGHT ANGL
E (90º).
up of other, smaller
angles.
Angles in a f
our-sided
shap
o 360º.
Angles in a tr
iangle
o 180º.
Angles on a s
traight
46 Chapter 1
finding missing angles
I
f tw
o a
n
g
l
e
s
a
dd up
t
o 1
8
0
º
,
t
he
y a
r
e
SUPPL
EME
NTA
RY.
If tw
up t
o 90º, they ar
e
COMPLEME
NT
ARY.
P
arallel lines make rep
ea
t
sets of vertica
l angles.
F
, Z, and N pa
tterns
around para
llel lines sav
e
y
ou a ton of ma
th.
V
ertica
l angles ar
e
equal (and opp
osi
te
each other).
you are here 4 47
who does what solution
up to 180º
Match each technique for finding missing angles to a sketch. You can use
each technique just once, but some sketches will need more than one to
find the missing angle.
Vertical angles are equal
Parallel lines cross other
lines at the same angles
Angles on a straight line add
up to 180º
Angles in a right angle add
up to 90º
Angles in a four-sided
73º
105º
93º
101º
32º
56º
62º
SOlUTion
?º = 180º - (56º+ 62º)
= 62º
73º
? = 73º
75º
?º = 360º -
(75º + 93º +
101º) = 91º
? = 90º - 32º
= 58º
48 Chapter 1

## With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

No credit card required