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Which condition is NOT sufficient on its own to prove two triangles similar?

Class 10Criteria for SimilarityGeometry — Similarity
  • ATwo sides proportional (no angle)
  • BThree sides proportional
  • CTwo angles equal
  • DTwo sides proportional and included angle equal

Step-by-Step Solution

Two proportional sides without information on the included angle does not fix the shape; no valid criterion. The others are SSS, AA, SAS.
Answer: A) Two sides proportional (no angle)

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