Common Core State Standard: 5.G.3

Grade 5
Subject MATH
Domain Geometry
Theme Classify two-dimensional figures into categories based on their properties
Standard 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.
Reference URL http://www.corestandards.org/Math/Content/5/G
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