Mathematics (2019) Grade(s): 3

MA19.3.26

Recognize and describe polygons (up to 8 sides), triangles, and quadrilaterals (rhombuses, rectangles, and squares) based on the number of sides and the presence or absence of square corners.

Unpacked Content

Knowledge

Students know:
  • that shapesin different categories may share attributes and that the shared attributes can define a larger category.

Skills

Students are able to:
  • Identify two-dimensional shapes.
  • Sort shapes according to number of sides.
  • Sort quadrilaterals based on the presence or absence of square corners.
  • Draw examples of squares, rectangles, and rhombuses.
  • Draw quadrilaterals that are not rhombuses, rectangles, and squares.

Understanding

Students understand that:
  • Attributes of a shape help make decisions about how to categorize the shape.
  • Certain attributes are needed to belong to the subcategories of rhombuses, rectangles, and squares.
  • Sometimes a shape does not have the attributes needed to belong to the subcategories of rhombuses, rectangles, and squares.

Vocabulary

  • Attribute
  • Category
  • Sub-category
  • Opposite sides
  • Angles
  • Quadrilateral
  • Triangle
  • Pentagon
  • Hexagon
  • Septagon
  • Heptagon
  • Octagon
  • Polygon
  • Square
  • Trapezoid
  • Rhombus
  • Rectangle
  • Two-dimensional
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