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4.G.A.2

Classify two-dimensional figures based on the presence or absence of parallel or perpendicular lines, or the presence or absence of angles of a specified size. Recognize right triangles as a category, and identify right triangles.

Tasks

Finding an unknown angle
Are these right?
What shape am I?
Defining Attributes of Rectangles and Parallelograms
What is a Trapezoid? (Part 1)