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Triangle ABC ~ triangle DEF such that AB = 5 cm, BC = 8 cm, CA = 7 cm and the smallest side of triangle DEF is 10 cm.
The smallest side corresponds to AB. Find the perimeter of triangle DEF (in cm).

Class 10Criteria for SimilarityGeometry — Similarity
  • A44
  • B40
  • C36
  • D80

Step-by-Step Solution

Scale factor = 10/5 = 2. Perimeter of ABC = 5+8+7 = 20 cm, so DEF perimeter = cm.
Answer: B) 40

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