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In the SAS criterion, the angle that must be equal is the angle:

Class 9Criteria for CongruenceGeometry — Triangles
  • Aincluded between the two equal sides
  • Bopposite the longest side
  • Cany one angle
  • Dthe smallest angle

Step-by-Step Solution

SAS requires two sides and the INCLUDED angle (the angle between those two sides) to be equal.
Answer: A) included between the two equal sides

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