48. Given:
AC
5
BD
Prove:
AB
5
CD
Proof:
49.
/
ONM
,
/
MNR
50.
/
PMQ
>
/
QMN
51.
N
or
R
52.
/
POQ
,
/
QON
,
/
NOM
,
/
MOP
53.
obtuse
54.
Sample answer:
NR
#$
and
NP
#$
55.
/
NML
,
/
NMP
,
/
NMO
,
/
RNM
,
/
ONM
Chapter 2 Study Guide and Review
Page 115
Vocabulary and Concept Check
1.
conjecture
2.
truth value
3.
compound
4.
and
5.
hypothesis
6.
converse
7.
Postulates
8.
informal proof
Pages 115–120
LessonbyLesson Review
9.
m
/
A
1
m
/
B
5
180
10.
Y
is the midpoint of
X
w
Z
w
.
11.
LMNO
is a square.
12.
2
1
.
0 and in a right triangle with right angle
C
,
a
2
1
b
2
5
c
2
.; false, because
p
is false and
q
is true.
13.
In a right triangle with right angle
C
,
a
2
1
b
2
5
c
2
or the sum of the measures of two
supplementary angles is 180.; true, because
q
is
true and
r
is true.
14.
The sum of the measures of two supplementary
angles is 180 and
2
1
.
0.; false, because
r
is true
and
p
is false.
15.
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 Fall '10
 Dr.Zhan
 Calculus, PreCalculus, Angles, Contrapositive, a2 b2 c2

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