Lesson Plan

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Big Ideas

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Objectives

Students will become more fluent in their understanding of two-dimensional geometric figures by describing figures’ attributes, sorting figures according to their attributes, and identifying lines of symmetry. Students will:

  • identify familiar shapes in the classroom.

  • review key vocabulary.

  • create shapes by folding paper along lines of symmetry.

  • analyze and sort new shapes according to their attributes.

  • generalize about definitions of different polygon shapes.


Essential Questions

  • None listed in the SAS materials.


Vocabulary

  • Attribute: A property of an object. Something you can say the object has such as size, color, length, etc. [IS.1 - All Students]

  • Shape: The form of an object–how it is laid out in space (not what it is made of, or where it is).

  • Polygon: A union of segments connected end to end, such that each segment intersects exactly two others at its endpoints.

  • Face: A plane figure that serves as one side of a solid figure.

  • Vertex (pl. vertices): A point where lines, rays, sides of a polygon, or edges of a polyhedron meet (corner).

  • Parallel: Always the same distance apart.

  • Side: 1) A line segment connected to other segments to form a polygon. 2) An edge of a polyhedron.

  • Angle: Two rays that share an endpoint.

  • Quadrilateral: A polygon with four sides.

  • Pentagon: A polygon with five sides.

  • Hexagon: A polygon with six sides.

  • Geometry: The mathematics of the properties and relationships of points, lines, angles, surfaces, and solids.

  • Line of Symmetry: A line that divides a figure into two halves that are mirror images of each other.


Duration

60–90 minutes [IS.2 - All Students]


Prerequisite Skills


Materials


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Comments


Erin

Erin

The resources in this unit are supportive in helping students understand the symmetry of shapes. For example, worksheet M-2 consists of the teacher creating a magnifying glass that students can use as a tool to investigate two dimensional shapes that already exist in their surrounding. The hands on approach to identifying two dimensional shapes is valuable.

Posted more than 90 days ago
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