Engineering Board Exam Reviewer · Triangles · medium

In triangle ABC, D is on AB and E is on AC with DE BC. If AD=4, AB=10 and BC=15, find DE.

  1. 3.75
  2. 9
  3. 6
  4. 7.5

Answer

C. 6

Solution

Triangles ADE and ABC are similar: DE/15=4/10 DE=6.

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