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An architect overlays two identical triangular tiles by rotating one. After overlay every vertex and edge coincides.
The minimum number of measured equal parts needed beforehand to be SURE they would coincide is:

Class 9Criteria for CongruenceGeometry — Triangles
  • A4
  • B3
  • C6
  • D2

Step-by-Step Solution

Any valid criterion (SSS/SAS/ASA/AAS/RHS) needs exactly 3 correctly chosen equal parts to guarantee congruence.
Answer: B) 3

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