Teacher's Guide - Pearson

) AB 5 17.1 units; AC 5 12 units;BC 5 17.1 units è Isoscelesc) AB 5 6.3 units; AC 5 8.5 unitsBC 5 10.4 units è Not isoscelesd) AB 5 4.1 units; AC 5 4.1 units;BC 5 2 units è IsoscelesExtension Activity 9.1 (Student’s Book page 161)1. AD 5 3 units; DB 5 4 units2. 3 units in y-direction and 4 units in x-direction.3. AB 5 5 units4. AB 5 ​√ ____________________________(0 2 4) 2 1 (3 2 0) 2 1 (0 2 0) 2 ​5 5 units5. E is in the y-z-plane which means zero units in the x-direction, but 3 units in they- and 2 units in the z-direction.6. AE 5 ​√ ___29 ​ 5 5.4 units7. AE 5 ​√ __________AB 2 1 BE 2 ​5 ​√ _______5 2 1 2 2 ​5 5.4 unitsActivity 9.2 (Student’s Book page 162)1.–3.7654321yA(2;3)C(5;5)2 4 6 8B(8;7)4. x 5 _____ 2 1 8​2 ​ 5 5; y 5 _____ ​ 3 1 7​ 5 5, so c 5 (5;5)25. Depends on students' drawing.6. x 5 x ______1 x 1 2​, y 5 ______y​11 y 2​227. Students’ own answers.xExercise 9.2 (Student’s Book page 162)1. a) (5.5;5.5)b) (4;3.2)Chapter 9: Coordinate geometry49