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Riya draws triangle ABC and triangle DEF. She measures angle A = 55°, angle B = 65° in the first, and angle D = 55°, angle F = 60° in the second.
She wants to know if the triangles are similar with A<->D correspondence.
Check the third angles and decide.

Class 10Criteria for SimilarityGeometry — Similarity
  • AYes, similar by AA (angles 55, 65, 60 match)
  • BNo, only one angle matches
  • CNo, sides are needed
  • DCannot decide without lengths

Step-by-Step Solution

First: angles 55, 65, 60. Second: angle D = 55, F = 60, so E = 180 - 55 - 60 = 65. Both have {55, 65, 60}, so two angles match — similar by AA.
Answer: A) Yes, similar by AA (angles 55, 65, 60 match)

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