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Triangle ABC ~ triangle DEF with the scale factor (ABC : DEF) equal to 2 : 1. The corresponding sides are AB = and DE = .
Form the equation from AB/DE = 2/1 and solve for .

Class 10Criteria for SimilarityGeometry — Similarity
  • A5
  • B10
  • C6
  • D4

Step-by-Step Solution

AB/DE = 2/1 gives , so , hence . (Check: AB = 10, DE = 5, ratio 2:1.)
Answer: A) 5

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