Access Point #: MAFS.912.G-CO.2.AP.8a (Archived Access Point)

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Use the definition of congruence, based on rigid motion, to develop and explain the triangle congruence criteria; ASA, SSS, and SAS.


Essential Understandings


  • Given two triangles, match the corresponding sides on each triangle.
  • Given two triangles, match the corresponding angles on each triangle.
  • Mark the pieces of the triangle that are congruent.
  • Identify which triangles are and are not congruent.
  • Using graphs or geometry software, mark the pieces of the triangle that are congruent.

Number: MAFS.912.G-CO.2.AP.8a Category: Access Points
Date Adopted or Revised: 07/14 Cluster: Understand congruence in terms of rigid motions. (Geometry - Major Cluster)

Clusters should not be sorted from Major to Supporting and then taught in that order. To do so would strip the coherence of the mathematical ideas and miss the opportunity to enhance the major work of the grade with the supporting clusters.

Related Standards

Name Description
MAFS.912.G-CO.2.8: Explain how the criteria for triangle congruence (ASA, SAS, SSS, and Hypotenuse-Leg) follow from the definition of congruence in terms of rigid motions.

Related Courses

Name Description
1200400: Foundational Skills in Mathematics 9-12
1206300: Informal Geometry
1206310: Geometry
1206320: Geometry Honors
7912060: Access Informal Geometry
1206315: Geometry for Credit Recovery
7912065: Access Geometry

Related Resources

Element Cards

Name Description
High School Math Element Cards:

Element Cards are available to assist in planning for instruction. They are designed to promote understanding of how students move toward the academic standards. Element Cards contain one or more access points, essential understandings, suggested instructional strategies and suggested supports.