Grade Band : HIGH SCHOOL. Domain : CONGRUENCE. Why this domain is a priority for professional development.
A priority for HS teachers is to see that the transformational approach (a la 8th grade) can provide a coherent scaffold for precision of definitions and explanations/proofs of the geometric theorems in HS (e.g. SAS, alt int angles)
Furthermore, the transformations provide a link with functions (algebra and cooridantization)