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In This Unit of Study…

Third graders use precise language to identify and draw quadrilaterals. Students distinguish a quadrilateral as a closed figure with four straight sides, and they notice the relationships between angles and between opposite sides within a quadrilateral. Within the category of quadrilaterals, students can classify and draw subcategories of shapes, such as parallelograms, rhombi, rectangles, squares, and trapezoids. Students use deductive reasoning   to justify their thinking about the categories into which shapes are sorted, while they gain a deeper understanding of “if . . .,  then . . .” relationships. For example, if a shape is a quadrilateral, then it must have four sides.

B.E.S.T. Benchmarks:

  • MA.3.GR.1.1 Describe and draw points, lines, line segments, rays, intersecting lines, perpendicular lines and parallel lines. Identify these in two-dimensional figures. 
  • MA.3.GR.1.2 Identify and quadrilaterals based on their defining attributes. Quadrilaterals include parallelograms, rhombi, rectangles, squares and trapezoids. 
  • MA.3.GR.1.3 Draw line(s) of symmetry in a two-dimensional figure and identify line-symmetric two-dimensional figures. 

Overarching Key Concepts:

  • Identify and draw attributes of two-dimensional figures
  • Idenify and draw quadrilateral based on their defining attributes
  • Identify and draw lines of symmetry in two-dimensional figures