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1 Name: Class: _ Date: _ ID: A Review Package 6 Multiple Choice Identify the choice that best completes the statement or answers the question. 1. Congruent sides between two objects tell us: a. That the two objects are similar. b. That the two objects have congruent angles. c. That the two objects have the same area. d. None of the above. 2. A school zone traffic sign has five sides. What must you know about the sign in order to produce more traffic signs of a similar shape? a. The sign s number of sides. c. The sign s height and width. b. The sign s size and weight. d. The sign s side lengths and angles. 3. A doorway of width 3.25 ft and height 7.25 ft is similar to another doorway of width x and height 9.06 ft. What is the measure of x? a ft c ft b ft d ft 4. A table of width 5.25 ft and length 7.25 ft is similar to another table of length 9.06 m and width x. What is the measure of x? a m c m b m d m 5. A greeting card of height 16 cm and width 12 cm is similar to a get-well card of height 24 cm and width x. What is the measure of x? a cm c cm b cm d cm 1
2 Name: ID: A 6. What is necessary to make the two shapes below similar? a. Their corresponding sides must be proportional and their corresponding areas also must be proportional. b. Their corresponding angles must be the same and their corresponding sides must be proportional. c. Their corresponding angles must be the same and their corresponding areas must be proportional. d. Their corresponding angles must be supplementary and their corresponding sides must be proportional. 7. A rectangular exercise trampoline is 2.5 m wide and 6 ft long. A large rectangular recreation trampoline is much bigger, but a similar shape. If it is 10 m wide, how long is it? a. 24 ft c. 3.5 ft b. 25 ft d. 12 ft 8. Any two regular pentagons can be considered similar shapes. a. Always. b. Sometimes. They must have the same side lengths. c. Sometimes. It depends on the orientation of the pentagons. d. Never. 9. If the scale on a map of the world is 750 km:1 cm, what distance would be represented by 12 cm on the map? a km c km b km d km 10. A stop sign has eight sides. What must you know about the sign in order to produce more stop signs of a similar shape? a. The stop sign s height and width. c. The stop sign s size and weight. b. The stop sign s side lengths and angles. d. The stop sign s number of sides. 2
3 Name: ID: A 11. A carpet is 6 m wide and 8 m long. It is similar to another carpet that is 12 m wide. What is its length? a. 21 m c. 16 m b m d. 13 m 12. A pen flashlight has a length of 7 cm and a width of 1 cm. A searchlight has a length of 1.19 m and a width of 17 cm. The dimensions of the searchlight are how many times bigger than the flashlight? a. 20 times c. 17 times b. 19 times d. 13 times 13. A notebook has a length of 11 in and a width of 9 in. A pocket notebook is similar in shape and has a length of 7.3 in. What is the width of the pocket notebook? a. 5.6 in c. 6.2 in b. 6.3 in d. 6.0 in 14. A four-sided polygon has side lengths of 47 cm, 52 cm, 32 cm, and 69 cm and interior angles of 23, 69, 81, and 187. If a larger polygon with a similar shape is created by a scale factor of 1.7, what will its angles be? a. 39, 117, 138, 318 c. 23, 69, 81, 187 b. 39, 69, 138, 187 d. 23, 117, 81, A polygon has side lengths of 40 mm, 45 mm, and 25 mm and interior angles of 20, 60, and 100. If a smaller polygon with a similar shape is created by a scale factor of 0.4, what will its side lengths be? a. 8 mm, 24 mm, 40 mm c mm, mm, 24.8 mm b mm, 18.0 mm, 10.0 mm d mm, mm, mm 16. A square of unknown side lengths is enlarged to a new square of similar shape. If the area of the new square is 20 times larger than the original, what was the scale factor? a c b d Two triangles are considered to be similar if. a. at least two ratios of side lengths are the same. b. at least one ratio of side lengths is the same. c. at least two corresponding angles are the same. d. at least one corresponding angle is the same. 18. A triangle has a leg of 14 cm. The corresponding side of a similar triangle is 182 cm. How many times larger is the similar triangle? a. 11 c. 12 b. 14 d. 13 3
4 Name: ID: A 19. A right triangle has a base of 46 cm. A similar triangle has a base of 874 cm. How many times larger is the similar triangle? a. 19 c. 18 b. 17 d A right triangle and an isosceles triangle can be similar in shape. a. Always. b. Sometimes. Their angles must add to 180. c. Sometimes. Only if the angles are 45, 45, and 90. d. Never. Short Answer 1. The three interior angles of a triangle are 45, 40, and 95. A second triangle is similar to this first one. What are its interior angles? 2. François builds two wooden toy chests. One is a rectangular prism with a length of 1 m, a width of 40 cm, and a height of 45 cm. The other is a rectangular prism with a length of 60 cm, a width of 24 cm, and a height of 27 cm. Are the toy chests similar? Show your work. 3. A triangle has two interior angles of 44 and 85. A second triangle has two interior angles of 44 and 53. Are these two triangles similar? Explain. 4. A triangle has side lengths of 6 cm, 9 cm, and 11 cm. The shortest side of a similar triangle is 21 cm. What are the lengths of its other two sides? 5. Is ΔABC similar to ΔXYZ? Explain your answer. 4
5 ID: A Review Package 6 Answer Section MULTIPLE CHOICE 1. ANS: D PTS: 1 DIF: Easy REF: ANS: D PTS: 1 DIF: Easy REF: ANS: A PTS: 1 DIF: Moderate REF: ANS: C PTS: 1 DIF: Moderate REF: ANS: C PTS: 1 DIF: Moderate REF: ANS: B PTS: 1 DIF: Difficult REF: ANS: A PTS: 1 DIF: Difficult REF: ANS: A PTS: 1 DIF: Easy REF: ANS: A PTS: 1 DIF: Easy REF: ANS: B PTS: 1 DIF: Easy REF: ANS: C PTS: 1 DIF: Moderate REF: ANS: C PTS: 1 DIF: Difficult REF: ANS: D PTS: 1 DIF: Difficult REF: ANS: C PTS: 1 DIF: Moderate REF: 6.3 OBJ: Geometry LOC: G-SO3 TOP: Drawing Similar Polygons 1
6 ID: A 15. ANS: B PTS: 1 DIF: Moderate REF: 6.3 OBJ: Geometry LOC: G-SO3 TOP: Drawing Similar Polygons 16. ANS: A PTS: 1 DIF: Difficult REF: 6.3 OBJ: Geometry LOC: G-SO3 TOP: Drawing Similar Polygons 17. ANS: C PTS: 1 DIF: Easy REF: 6.4 OBJ: Geometry LOC: G-SO4 TOP: Similar Triangles 18. ANS: D PTS: 1 DIF: Moderate REF: 6.4 OBJ: Geometry LOC: G-SO3 TOP: Similar Triangles 19. ANS: A PTS: 1 DIF: Moderate REF: 6.4 OBJ: Geometry LOC: G-SO3 TOP: Similar Triangles 20. ANS: C PTS: 1 DIF: Difficult REF: 6.4 OBJ: Geometry LOC: G-SO3 TOP: Similar Triangles SHORT ANSWER 1. ANS: Regardless of size, no two shapes can be similar unless their corresponding angles are the same. Therefore, the interior angles of the second triangle must also be 45, 40, and 95. PTS: 1 DIF: Easy REF: 6.1 OBJ: Geometry LOC: G-SO3 TOP: Similar Polygons 2. ANS: Convert 1 m to cm. 1 m 100 = 100 cm Calculate whether the ratios between the side lengths of the two rectangular prisms are equal = = = 0.6 The ratios are equal; therefore, the toy chests are similar. PTS: 1 DIF: Moderate REF: 6.2 OBJ: Geometry LOC: G-SO3 TOP: Determining if Two Polygons are Similar 3. ANS: No. The first triangle has interior angles of 44, 85, and 51, because the sum of the angles in any triangle is 180. The second triangle has an angle of 53, so it cannot be similar. PTS: 1 DIF: Easy REF: 6.4 OBJ: Geometry LOC: G-SO3 TOP: Similar Triangles 2
7 ID: A 4. ANS: Calculate the scale factor between the shortest sides of the two triangles = 3.5 The larger triangle is 3.5 times bigger than the smaller triangle. Calculate the lengths of the other two sides. 9 cm 3.5 = 31.5 cm 11 cm 3.5 = 38.5 cm The other two sides of the larger triangle are 31.5 cm and 38.5 cm. PTS: 1 DIF: Moderate REF: 6.4 OBJ: Geometry LOC: G-SO3 TOP: Similar Triangles 5. ANS: No, they are not similar. The side lengths of the two triangles are proportional, but the order of the angles is not stated correctly. AB is the hypotenuse of the first triangle, but XY is one of the legs. An expression of similarity needs to be written with the corresponding angles in the right order. ΔABC is similar to ΔXZY. PTS: 1 DIF: Moderate REF: 6.4 OBJ: Geometry LOC: G-SO3 TOP: Similar Triangles 3
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