Congruence Representer

Sub Trajectory: comparing

Refers to geometric properties and transformations (geometric motions) to explain congruence.


You may see this:

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Other Examples:

  • A child says "These must be 'congruent,' because they have equal sides, all square corners, and I can move them on top of each other exactly."
  • Children measure the sides and angles of two shapes, then compare them to see if attributes match and the shapes can be considered congruent. 

Help your student become a(n) Congruence Representer

Activities require children to determine congruence by superposition or checking all relevant attributes, and apply the understanding that all properties of the congruent shapes will be equal. 

Special Thanks To

Institute of Education Sciences
The research reported here was supported by the Institute of Education Sciences, U.S. Department of Education, through grant numbers R305K050157, R305A120813, R305A110188, and R305A150243. to the University of Denver. The opinions expressed are those of the authors and do not represent views of the Institute or the U.S. Department of Education.