Chapter 18
Two-Dimensional Shapes
3rd Grade: Chapter 18 Outline
3rd Grade: Chapter 18 Outline
Week 26 - Week 27
Week 26 - Week 27
Essential Questions:
Essential Questions:
- How can I analyze and prove polygons and quadrilaterals?
- How can I analyze the relationships between congruent figures?
- How can I decide whether or not an object/shape has a line of symmetry?
Content:
Content:
Students will know and understand:
- What a polygon is.
- What a quadrilateral is.
- How to rotate shapes.
- How to identify congruent figures.
- How to identify the line of symmetry.
Skills:
Skills:
Students Will:
- Identify open and closed figures, special polygons, and quadrilaterals.
- Classify polygons by the number of sides, vertices, and angles.
- Classify quadrilaterals by parallel sides, length of sides, and angles.
- Combine and separate polygons to make other polygons.
- Identify slide, flip, and turn.
- Identify congruent figures.
- Identify symmetric figures.
- Find the line of symmetry.
Vocabulary:
Vocabulary:
- plane figure
- open figure
- closed figure
- polygon
- vertex
- quadrilateral
- parallel
- rhombus
- parallelogram
- pentagon
- octagon
- tangram
- flip
- slide
- turn
- rotate
- congruent
- symmetry
- line of symmetry
Upon completion of Unit 18:
- 3.G.A.1. Understand that shapes in different categories (e.g., rhombuses, rectangles, and others) may share attributes (e.g., having four sides), and that the shared attributes can define a larger category (e.g., quadrilaterals). Recognize rhombuses, rectangles, and squares as examples of quadrilaterals, and draw examples of quadrilaterals that do not belong to any of these subcategories.
- MP.1. Make sense of problems and persevere in solving them.
- MP.2. Reason abstractly and quantitatively.
- MP.3. Construct viable arguments and critique the reasoning of others.
- MP.5. Use appropriate tools strategically.
- MP.6. Attend to precision.