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Geometry Answer Key: CK-12 Middle School Math Concepts - Grade 7, Study notes of Algebra

Brussels School of International StudiesAlgebra

Chapter 8 – Geometry. Answer Key. CK-12 Middle School Math Concepts - Grade 7. 1. 8.1. Angle Classification. Answers. 1. Straight. 2. Obtuse. 3. Acute.

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Chapter 8 – Geometry Answer Key
CK-12 Middle School Math Concepts - Grade 7 1
8.1 Angle Classification
Answers
1. Straight 2. Obtuse 3. Acute 4. Acute 5. Right
6. Obtuse 7. Right 8. Obtuse 9. Acute 10. Obtuse
11. Right 12. Straight 13. acute 14. Acute 15. Obtuse
8.2 Angle Pairs
Answers
1. Complementary 2. Complementary 3. Supplementary
4. Supplementary 5. Neither 6. Supplementary
7. Supplementary 8. Neither 9. Neither
10. Complementary 11. Neither 12. Neither
13. Complementary 14. Neither 15. Neither
8.3 Supplementary and Complementary Angle Pairs
Answers
1. 27° 2. 7° 3. 87° 4. 67° 5. 20°
6. 61° 7. 24° 8. 3° 9. 147° 10. 77°
11. 107° 12. 102° 13. 81° 14. 70° 15. 53°
8.4 Vertical Angles
Answers
1. Intersecting 2. Parallel 3. Intersecting 4. Perpendicular
5. Parallel 6. Perpendicular 7. Intersecting 8. Vertical
9. Adjacent 10. Adjacent 11. Vertical 12. Vertical
13. Adjacent 14. Vertical 15. Adjacent 16. 95°
17. 55° 18. 107° 19. 98° 20. 67°
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8.1 Angle Classification

Answers

  1. Straight 2. Obtuse 3. Acute 4. Acute 5. Right
  2. Obtuse 7. Right 8. Obtuse 9. Acute 10. Obtuse
  3. Right 12. Straight 13. acute 14. Acute 15. Obtuse

8.2 Angle Pairs

Answers

  1. Complementary 2. Complementary 3. Supplementary
  2. Supplementary 5. Neither 6. Supplementary
  3. Supplementary 8. Neither 9. Neither
  4. Complementary 11. Neither 12. Neither
  5. Complementary 14. Neither 15. Neither

8.3 Supplementary and Complementary Angle Pairs

Answers

  1. 27° 2. 7° 3. 87° 4. 67° 5. 20°
  2. 61° 7. 24° 8. 3° 9. 147° 10. 77°
  3. 107° 12. 102° 13. 81° 14. 70° 15. 53°

8.4 Vertical Angles

Answers

  1. Intersecting 2. Parallel 3. Intersecting 4. Perpendicular
  2. Parallel 6. Perpendicular 7. Intersecting 8. Vertical
  3. Adjacent 10. Adjacent 11. Vertical 12. Vertical
  4. Adjacent 14. Vertical 15. Adjacent 16. 95°
  5. 55° 18. 107° 19. 98° 20. 67°

8.5 Parallel and Perpendicular Lines

Answers

  1. True 2. False 3. False 4. True 5. False
  2. True 7. True 8. True 9. True 10. Intersecting
  3. Intersecting 12. Parallel 13. Parallel 14. Intersecting 15. Parallel

8.6 Corresponding Angles

Answers

  1. Angles next to each other
  2. Angles opposite each other with the same measure
  3. Lines that will never intersect
  4. Lines that intersect at a 90 degree angle
  5. An angle pair whose sum is 180°
  6. An angle pair whose sum is 90°
  7. Angles formed when two parallel lines are intersected
  8. vertical
  9. Angle P
  10. Angle Q
  11. True
  12. False
  13. False
  14. 4
  15. No

8.11 Regular and Irregular Polygons

Answers

  1. Trapezoid 2. Rectangle 3. Square 4. Square
  2. square, trapezoid Angle F = 90°, Angle E = 90°, Angle G = 90°, Angle H = 55°, Angle I = 90°
  3. True 7. True 8. True
  4. False 10. False 11. True
  5. True 13. False 14. Regular hexagon
  6. Irregular heptagon 16. Regular pentagon 17. Irregular octagon

8.12 Congruent Figures

Answers

  1. Angle S
  2. ST
  3. Angle Q
  4. 2 cm
  5. 85°
  6. 85°
  7. True
  8. No
  9. Yes
  10. No
  11. No
  12. No
  13. Yes, congruent figures have the same measure
  14. Congruent figures have the same size and shape
  15. False

8.13 Similarity

Answers

  1. Congruent
  2. Similar
  3. Similar
  4. Neither
  5. Congruent
  6. Neither
  7. True
  8. False
  9. False
  10. Two equal ratios form a proportion
  11. True
  12. Similar figures have the same shape but different size
  13. Congruent
  14. Having exactly the same size, shape and measure
  15. True

8.14 Scale Factor of Similar Polygons

Answers

  1. 1/5 2. 1/6 3. 1/2.5 4. 1/3.5 5. 3/
  2. 4/1 7. ¼ 8. 2/1 9. 3/1 10. 8/
  3. 5/1 12. 6/1 13. 2/1 14. 3/1 15. 1/

8.19 Translations, Rotations and Reflections

Answers

  1. (-1, 5)(-5, 1)(-1, -3)
  2. (3, 2)(-1, -2)(3, -6)
  3. (-4, 2)(-10, -2)(-6, -6)
  4. (-7, 2)(-11, -2)(-7,-6)
  5. (1,1)(-3, -3)(1, -7)
  6. (-2, 4)(-6, 0)(-2, -4)
  7. (0, 5)(-4, 1)(0, -3)
  8. (2, 1)(-2, 5)(-6, 1)
  9. (1, -2)(5, 2)(1, 6)
  10. (-1, -2)(-5, 2)(-1, 6)
  11. (1, 2)(5, -2)(1, -6)
  12. (2, 7)(-2, 3)(2, -1)
  13. (-5, -4)(-11, -8)(-5, -12)
  14. True
  15. False