Page 136 - Math Course 3 (Book 2)
P. 136

Proportional Parts of Triangles






          Skill Practice!




        Parallel Lines and Proportional Parts

        1. If JK = 7, KH = 21, and JL = 6, Find LI         2. Find x and TV if RU = 8, US = 14,
                                                               TV = x –  1 and VS = 17.5.






















        Determine whether BC || DE.


        3. AD = 15, DB = 12, AE = 10, and EC = 8




        4. BD = 9, BA = 27, and CE is one third of EA




        5. AE = 30, AC = 45, and AD is twice DB







        COORDINATE GEOMETRY For Exercises 6–8, use the following information.

        Triangle ABC has vertices A( –5, 2), B(1, 8), and C(4, 2).
        Point D is the midpoint of AB and E is the midpoint of AC.

        6. Identify the coordinates of D and E.




        7. Show that BC is parallel to DE




                           1
        8. 8. Show that DE =      BC.
                           2






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