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.
Khan Academy ResourcesTypes of triangles reviewQuadrilaterals reviewQuadrilateral typesClassify triangles by anglesClassify triangles by both sides and anglesClassify triangles by side lengthsClassify shapes by line and angle typesQuadrilateral propertiesWorked example: Classifying triangles Classifying triangles by anglesClassifying shapes by lines and anglesClassifying triangles Classifying shapes by line and angles types

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