25. Given:
AB
DE
C
is the midpoint
of
BD
.
Prove:
AC
CE
Proof:
26. Given:
AB
EF
and
BC
DE
Prove:
AC
DF
Proof:
27.
Sample answers:
LN
QO
and
LM
MN
RS
ST
QP
PO
28.
Sample answer: You can use segment addition to
find the total distance between two destinations
by adding the distances of various points in
between. Answers should include the following.
• A passenger can add the distance from San
Diego to Phoenix and the distance from Phoenix
to Dallas to find the distance from San Diego to
Dallas.
• The Segment Addition Postulate can be useful if
you are traveling in a straight line.
29.
B;
AD
¬
AB
BC
CD
¬
14
1
4
12
3
4
12
1
4
¬
39
1
4
AQ
¬
1
2
AD
¬
1
2
39
1
4
¬
19
5
8
BP
¬
1
2
BC
¬
1
2
12
3
4
¬
6
3
8
AP
¬
AB
BP
¬
14
1
4
6
3
8
¬
20
5
8
AP
¬
AQ
QP
20
5
8
¬
19
5
8
QP
1
¬
QP
30.
Let
x
be the price of a box of popcorn. Then a tub
of popcorn costs 2
x
.
60(2
x
)
¬
150
120
x
¬
150
x
¬
1.25
Thus, a box of popcorn costs $1.25 and a tub costs
2(1.25) or $2.50.
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 Fall '10
 Dr.Zhan
 Calculus, PreCalculus, Addition, State highways in Delaware

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