Arkansas Curriculum Frameworks
AR.Math.Content.5.G.B. Classify two-dimensional figures into categories based on their properties.
AR.Math.Content.5.G.B.3. Understand that attributes belonging to a category of two-dimensional figures also belong to all subcategories of that category. For example: All rectangles have four right angles and squares are rectangles, so all squares have four right angles. All isosceles triangles have at least two sides congruent and equilateral triangles are isosceles. Therefore, equilateral triangles have at least two congruent sides.
AR.Math.Content.5.G.B.4. Classify two-dimensional figures in a hierarchy based on properties.