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Common Core Teaching Resources

CCSS.MATH.CONTENT.4.G.A.2

In Grade 4 Standards for Mathematical Practice Geometry Draw and identify lines and angles, and classify shapes by properties of their lines and angles
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.