• As overheard at our Eureka Math training in Albany, NY...
  • “1st graders are demonstrating mastery of concepts that last year's 1st graders could not.”
  • “I am seeing 'academic conversations' between students and them demanding evidence from each other. Wow!!!”
  • “I have a 5th grader and I am teaching him this way of doing multiplication as soon as I get home today.”
  • “I have a college student and sure wish he had the learned the 'how' and not just the algorithm.”

Understand congruence in terms of rigid motions

G.CO.6

Use geometric descriptions of rigid motions to transform figures and to predict the effect of a given rigid motion on a given figure; given two figures, use the definition of congruence in terms of rigid motions to decide if they are congruent.

G.CO.7

Use the definition of congruence in terms of rigid motions to show that two triangles are congruent if and only if corresponding pairs of sides and corresponding pairs of angles are congruent.

G.CO.8

Explain how the criteria for triangle congruence (ASA, SAS, and SSS) follow from the definition of congruence in terms of rigid motions.