Grade 1 Unit of Study 7: Two-Dimensional Figures

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In This Unit of Study…

Students identify, compare, and sort two-dimensional figures (circles, semicircles, triangles, rectangles, squares, trapezoids, and hexagons) based on their defining attributes, and they sketch figures (triangles, rectangles, squares, and hexagons) when given defining attributes. They also identify parts of real-world objects that are modeled by two-dimensional figures. Students compose and decompose two-dimensional figures (rectangles, squares, trapezoids, triangles, semicircles, and hexagons). Students are not expected to define the attributes of trapezoids.

B.E.S.T. Benchmarks:

  • MA.1.GR.1.1 Identify, compare and sort two- and three-dimensional figures based on their defining attributes. Figures are limited to circles, semi-circles, triangles, rectangles, squares, trapezoids, hexagons, spheres, cubes, rectangular prisms, cones and cylinders.
  • MA.1.GR.1.2 Sketch two-dimensional figures when given defining attributes. Figures are limited to triangles, rectangles, squares and hexagons.
  • MA.1.GR.1.3 Compose and decompose two- and three-dimensional figures. Figures are limited to semi-circles, triangles, rectangles, squares, trapezoids, hexagons, cubes, rectangular prisms, cones and cylinders.
  • MA.1.GR.1.4 Given a real-world object, identify parts that are modeled by two- and three- dimensional figures. Figures are limited to semi-circles, triangles, rectangles, squares and hexagons, spheres, cubes, rectangular prisms, cones and cylinders.

Key Concepts:

  • I can identify, compare, and sort a variety of two-dimensional shapes based on their attributes.
  • I can sketch triangles, rectangles, squares, and hexagons when given defining attributes.
  • I can describe the attributes of a two-dimensional shape, such as sides, vertices, and faces.
  • I can compose and decompose two-dimensional figures.
  • I can identify two-dimensional shapes in real-world objects.
  • I can identify non-examples that lack one or more defining attributes.

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