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.
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This note was uploaded on 12/19/2011 for the course MAC 1140 taught by Professor Dr.zhan during the Fall '10 term at UNF.
 Fall '10
 Dr.Zhan
 Calculus, PreCalculus, Indirect Proof

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