Math 13900
Exam 3 A
Fall 2010
1
Circle the LETTER of the correct answer for #1-3.
(7 pts)1. Use the information given about the angles of triangles I, II, and III to determine which, if any,
of the triangles are similar.
I)
70
and 45
50
′
D
D
II)
64
10 and 45
50
′
′
D
D
III)
70
and 64
50
′
D
D
.
I and II only
.
II and III only
.
I and III only
.
I, II and III
. No similarity exists
A
B
C
D
E
(7 pts)2. Using a broken ruler that is missing the first several inches, a student sets the ruler against a
line segment such that the endpoints of the segment are at
5
3
and
9
8
16
4
respectively.
What is the length of the line segment?
1
2
1
4
9
16
1
8
3
16
. 4
inches
. 5
inches
. 4
inches
. 5
inches
. 4
inches
A
B
C
D
E
(7 pts)3. One polyhedron has surface area 192 cm
2
and volume 128 cm
3
.
Find the surface area and
volume of the polyhedron’s image for a size change with scale factor
3
4
.
2
3
2
3
2
3
2
3
2
3
.
SA:108 cm
V: 32 cm
.
SA: 48 cm
V: 32 cm
.
SA: 48 cm
V: 54 cm
.
SA: 36 cm
V: 32 cm
.
SA:108 cm
V: 54 cm
A
B
C
D
E

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