This preview shows page 1. Sign up to view the full content.
68.
true;
a
1
c
5
¬
2
1
6 or 8
a
1
b
5
¬
2
1
5 or 7
a
1
c
.
¬
a
1
b
since 8
.
7
Page 254
Practice Quiz 1
1.
BD
5
¬
DC
4
x
1
9
5
¬
7
x
2
6
9
5
¬
3
x
2
6
15
5
¬
3
x
5
5
¬
x
2.
A
w
D
w
'
B
w
C
w
, so
m
/
ADC
5
90.
2
y
2
6
5
¬
90
2
y
5
¬
96
y
5
¬
48
3.
Never; a median is a segment from one vertex to
the side opposite the vertex and never intersects
any other vertex.
4.
Always; an angle bisector lies between two sides
of the triangle and is contained in the triangle up
to the point where it intersects the opposite side.
So, the intersection point of the three angle
bisectors must also be inside the triangle.
5.
sometimes; true for an obtuse triangle but false
for an acute triangle
6.
sometimes; true for right triangles but false for
other triangles
7.
No triangle; by Exercise 4, the angle bisectors
always intersect at a point in the interior of the
triangle.
8.
m
/
T
.
m
/
S
.
m
/
U
, so the sides of
n
STU
in
order from longest to shortest are
S
w
U
w
,
T
w
U
w
,
S
w
T
w
.
9.
This is the end of the preview. Sign up
to
access the rest of the document.
 Fall '10
 Dr.Zhan
 Calculus, PreCalculus, Indirect Proof

Click to edit the document details