Texas Essential Knowledge and Skills (TEKS)
TX. 111. 6. Grade 4, Adopted 2012.
4.6. Geometry and measurement. The student applies mathematical process standards to analyze geometric attributes in order to develop generalizations about their properties. The student is expected to:
4.6 (D) 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.