# Geometry Midterm Exam Review 3. Square BERT is transformed to create the image B E R T, as shown.

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1 1. Reflect FOXY across line y = x. 3. Square BERT is transformed to create the image B E R T, as shown. 2. Parallelogram SHAQ is shown. Point E is the midpoint of segment SH. Point F is the midpoint of segment AQ Select all of the transformations that could have been performed. A) A reflection across the line y = x B) A reflection across the line y = -2x C) A rotation of 180 degrees clockwise about the origin D) A reflection across the x-axis, and then a reflection across the y-axis. E) A rotation of 270 degrees counterclockwise about the origin, and then a reflection across the x-axis. Which transformation carries the parallelogram onto itself? A) A reflection across line segment SA B) A reflection across line segment EF C) A rotation of 180 degrees clockwise about the origin D) A rotation of 180 degrees clockwise about the center of the parallelogram. 4. Smelly Kid performs a transformation on a triangle. The resulting triangle is similar but not congruent to the original triangle. Which transformation did Smelly Kid perform on the triangle? A) Dilation B) Reflection C) Rotation D) Translation Page 1 of 10

2 5. Triangle ABC had vertices of A(1, 1), B(2.5, 3) and C(0, -3). It is dilated by a scale factor of ½ about the origin to create triangle A B C. What is the length, in units, of side B C? 7. A translation is applied to DOG to create D O G. 6. Complete the statement to explain how it can be shown that two circles are similar. Circle M can be mapped onto circle N by a reflection across and a dilation about the center of circle M by a scale factor of Let the statement (x, y) (a, b) describe the translation. Create equations for a in terms of x and for b in terms of y that could be used to describe the translation. a = b = Page 2 of 10

3 8. Triangle HEN is shown. 10. Rhombus PQRS is shown in the coordinate plane. Points M and N are midpoints of their respective sides. Triangle H E N is created by dilating triangle HEN by a scale factor of 4. What is the length of? H E Select all of the transformations that map the rhombus onto itself. A) A 90 clockwise rotation around the center of the rhombus B) A 180 clockwise rotation around the center of the rhombus C) A reflection across NM D) A reflection across QS 9. A figure is fully contained in Quadrant II. The figure is transformed as shown. A reflection over the x-axis A reflection over the line y = x A 90 counterclockwise rotation about the origin. In which quadrant does the resulting image lie? A) Quadrant I B) Quadrant II C) Quadrant III D) Quadrant IV 11. Triangle ABC is reflected across the line y = 2x to form triangle RST. Select all of the true statements. A) AB = RS ( I know this notation is wrong, but some moron used this wrong notation on the state test.) B) AB = 2 RS ( I know this notation is wrong, but some moron used this wrong notation on the state test.) C) ABC~ RST D) ABC RST E) m BAC = m SRT F) m BAC = 2 m SRT Page 3 of 10

4 12. Triangle BAL is reflected across the line y = x. Draw the 14. The coordinate plane shows FGH and F"G"H" resulting triangle. Which sequence of transformations can be used to show that FGH~ F"G"H"? A) A dilation about the origin with a scale factor of 2, followed by a 180 clockwise rotation about the origin. B) A dilation about the origin with a scale factor of 2, followed by a reflection over the line y = x C) A translation 5 units up and 4 units left, followed by a dilation with a scale factor of ½ about point F D) A 180 clockwise rotation about the origin, followed by a dilation with a scale factor of ½ about F 13. All corresponding sides and angles of RST and DEF are congruent. Select all of the statements that must be true. A) There is a reflection that maps RS to DE B) There is a dilation that maps RST to DEF C) There is a translation followed by a rotation that maps RT to DF D) There is a sequence of transformations that maps RST to DEF E) There is not necessarily a sequence of rigid motions that maps RST to DEF Page 4 of 10

5 15. Two triangles are shown. 16. A triangle is shown on the coordinate grid. Draw the triangle after a transformation following the rule (x, y) (x 4, y + 3) Which sequence of transformations could be performed on EFG to show that it is similar to JKL? A) Rotate EFG 90 clockwise about the origin, and then dilate it by a scale factor of ½ with a center of dilation at point F B) Rotate EFG 180 clockwise about point E, and then dilate it by a scale factor of 2 with a center of dilation at point E C) Translate EFG 1 unit up, then reflect it across the x-axis, and then dilate it by a factor of ½ with a center of dilation at point E D) Reflect EFG across the x-axis, then reflect it across the line y = x, and then dilate it by a scale factor of 2 with a center of dilation at point F 17. Triangle ABC is dilated with a scale factor of k and a center of dilation at the origin to obtain triangle A B C. What is the scale factor? Page 5 of 10

6 18. A square is rotated about its center. Select all of the angles of rotation that will map the square onto itself. A) 45 degrees B) 60 degrees C) 90 degrees D) 120 degrees E) 180 degrees F) 270 degrees 20. Kyle performs a transformation on a triangle. The resulting is similar but not congruent to the original triangle. Which transformation did Kyle use? A) Dilation B) Reflection C) Rotation D) Translation 21. A study reports that in 2010 the population of the United States was 308,745,538 people and the land area was approximately 3,531,905 square miles. Based on the study, what was the population density, in people per square mile, of the United States in 2010? Round your answer to the nearest tenth. 19. Circle J is located in the first quadrant with center (a, b) and radius s. Felipe transforms Circle J to prove that it is similar to any circle centered at the origin with radius t. Which sequence of transformations did Felipe use? A) Translate Circle J by (x + a, y + b) and dilate by a factor of t s B) Translate Circle J by (x + a, y + b) and dilate by a factor of s t C) Translate Circle J by (x a, y b) and dilate by a factor of t s D) Translate Circle J by (x a, y b) and dilate by a factor of s t 22. Lainie wants to calculate the height of the sculpture. She places a mirror on the ground so that when she looks into the mirror she sees the top of the sculpture, as shown. What is the height, in feet, of the sculpture? Page 6 of 10

7 23. Triangle ABC is dilated with a scale factor of k and a 25. Triangle XYZ is shown. center of dilation at the origin to obtain triangle A B C. Which triangle must be similar to XYZ? A) A triangle with two angles that measure 40 degrees. B) A triangle with angles that measure 40 and 60 degrees C) A scalene triangle with only one angle that measures 100 degrees D) An isosceles triangle with only one angle that measures 40 degrees What is the scale factor? 24. A 9-foot ladder and a 4-foot ladder are leaning against a house. The two ladders create angles of the same measure with the ground. The 4-foot ladder has a height of 3.8 feet against the house. 26. AB has endpoints A(-1.5, 0) and B(4.5, 8). Point C is on line AB and is located at (0, 2). What the ratio of AC Round to 2 decimal places. CB? 27. AC has endpoints A(-1, -3.5) and C(5, -1). Point B is on AC and is located at (0.2, -3). What is the ratio of AB BC? What is the height, in feet, of the 9-foot ladder against the house? Page 7 of 10

9 30. PQR is shown, where ST RQ 31. Triangle ABC is shown. Marta wants to prove that SR = TQ. PS PT Place a statement or reason in each blank box to complete Marta s proof. Statement Reason 1. ST RQ 2. PST R PTS Q 3. PQR~ PTS PR = PS + SR PQ = PT + TQ 6. PS+SR PS = PT+TQ PT 7. PS + SR = PT + TQ PS PS PT PT 8. SR = TQ PS PT A. PR = PQ PS PT B. PS = PT SR ST C. P P 1. Given 2. Corresponding angles postulate 5. Segment addition postulate 6. Substitution PoE 7. Communitive PoE 8. Subtraction PoE D. AA Similarity E. ASA Similarity F. SSS Similarity G. Reflexive Property H. Segment addition postulate I. Corresponding sides of similar triangles are proportional J. Corresponding sides of similar triangles are congruent K. Alternate interior angles theorem L. Alternate exterior angles theorem Given: ABC is isosceles. Point D is the midpoint of AC. Prove: BAC BCA Statement Reason 1. ABC is isosceles. 1. Given D is the midpoint of AC 2. AD DC 2. Definition of midpoint 3. BA BC 3. Definition of isosceles triangle 4. BD exists 4. A line segment can be drawn between 5. BD BD any two points ABD CBD BAC BCA 7. AA congruency postulate SAS congruency postulate SSS congruency postulate CPCTC Reflexive property Symmetric property Midpoint theorem Page 9 of 10

10 32. The proof shows that opposite angles of a parallelogram are congruent. 34. Square ABCD has vertices at A(1, 2) and B(3, -3). What is the slope of BC? Given: ABCD is a parallelogram with diagonal AC Prove: BAD DCB Statement Reason 1. ABCD is a parallelogram with 1. Given diagonal AC 2. AB CD and AD BC 2. Definition of parallelogram Alternate interior angles theorem m 2 = m 3 4. Definition of congruent angles m 1 = m 4 5. m 1 + m 2 = m 4 + m 2 5. Addition property of equality 6. m 1 + m 2 = m 4 + m m 1 + m 2 = m BAD 7. Angle addition postulate m 3 + m 4 = m DCB 8. m BAD = m DCB 8. Substitution PoE 9. BAD DCB 9. Definition of congruent angles 35. Kevin asked Olivia what parallel lines are. Olivia responded, They are lines that never intersect. What important piece of information is missing form Olivia s response? A. The lines must be straight. B. The lines must be coplanar. C. The lines can be noncoplanar. D. The lines form four right angles. What is the missing reason in this partial proof? A) ASA B) Substitution PoE C) Angle addition postulate D) Alternate interior angles postulate 33. The graph of line m is shown 36. Triangle ABC has vertices at (-4, 0), (-1, 6) and (3, -1). What is the perimeter of triangle ABC, rounded to the nearest tenth? What is the equation of the line that is perpendicular to line m and passes through the point (3, 2)? Page 10 of 10

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