Cluster: Understand congruence and similarity using physical models, transparencies, or geometry software

Standard: Use informal arguments to establish facts about the angle sum and exterior angle of triangles, about the angles created when parallel lines are cut by a transversal, and the angle-angle criterion for similarity of triangles. For example, arrange three copies of the same triangle so that the three angles appear to form a line, and give an argument in terms of transversals why this is so.

Degree of Alignment:
1.5 Strong
(2 users)

Learning Domain: Geometry

Standard: Understand congruence and similarity using physical models, transparencies, or geometry software

Indicator: Use informal arguments to establish facts about the angle sum and exterior angle of triangles, about the angles created when parallel lines are cut by a transversal, and the angle-angle criterion for similarity of triangles. For example, arrange three copies of the same triangle so that the three angles appear to form a line, and give an argument in terms of transversals why this is so.

Degree of Alignment:
Not Rated
(0 users)

on Mar 27, 02:58am Evaluation

## Quality of Explanation of the Subject Matter: Limited (1)

More explanation could be given for each step so it is clear what is the intended outcome.