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
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8. 8. Show that DE = BC.
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