Math in Focus Chapter 18: Two-Dimensional Shapes
Trimester 3
Big Idea: Polygons can be classified by the number of sides, corners, and angles. Figures can be congruent or symmetrical, or both.
Vocabulary: plane figure, open figure, closed figure, polygon, vertex, quadrilateral, parallel, rhombus,
parallelogram, pentagon, octagon, tangram |
Key Visuals/Activities:
Lesson Preview:
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Learning Videos:Khan Academy Videos: Quadrilaterals
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Learning Links: |
Game Suggestions for Two-Dimensional Shapes:Tangrams: Khan Academy: IXL:
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Workbook Videos (by Daniel Lu):
Daniel Lu's Site for Workbook |
Common Core State Standards:
Geometry:
Reason with shapes and their attributes
Reason with shapes and their attributes
- CCSS.MATH.CONTENT.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.
- CC.K-12.MP.3 Construct viable arguments and critique the reasoning of others.
- CC.K-12.MP.5 Use appropriate tools strategically.
- CC.K-12.MP.6 Attend to precision.