139fa10ex3 - Math 13900 Exam 3 A Fall 2010 Circle the...

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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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