- A9
- B10
- C15
- D12
Step-by-Step Solution
DE ∥ BC makes triangle ADE similar to triangle ABC. AB = AD + DB = 10, so the ratio is AD : AB = 4 : 10 = 2 : 5. Then DE : BC = 2 : 5, so BC = .
Answer: C) 15
In triangle ABC, D lies on AB and E lies on AC with DE parallel to BC. If AD = 4, DB = 6 and DE = 6, what is the length of BC?
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