Classification of Two Dimensional Figures

HIERACHY OF

Two DIMENSIONAL FIGURES

1. Split the class into pairs.
2. Each pair should receive a card (page 1 below): Acute Triangle, Equilateral Triangle, Isosceles Triangle, Obtuse Triangle, Right Triangle, Quadrilateral, Square, Parallelogram, Rhombus, Rectangle, Trapezoid, Pentagon, Hexagon, and, Octagon.

3. Have each pair describe the polygon they receive. Essentially, it should be a list of qualifications and describing elements.

4. Page 2 or 3 of the attached cards. Page 2 has the name of the shape and the describing elements. Page 3 does not have the name of the shape, only the describing elements are listed. Depending on the level of the students, they can decide which card fits their shape or check their list to list of mathematical qualifications.

5. Have each pair, present their shape. Explaining what it means to be considered that shape.

6. As a class, brainstorm similarities and differences in the shapes. Use the Questioning Prompt Guide to lead students to the classification/heirachy idea.

7. Have the students form a conjecture of the heirachy, explaining their reasoning.

Focus Content Area Standards

CCSS.MATH.CONTENT.5.G.B.3

Understand that attributes belonging to a category of two-dimensional figures also belong to all subcategories of that category. For example, all rectangles have four right angles and squares are rectangles, so all squares have four right angles.

CCSS.MATH.CONTENT.5.G.B.4

Classify two-dimensional figures in a hierarchy based on properties.

Standards for Mathematical Practice

CCSS.MATH.PRACTICE.MP1 Make sense of problems and persevere in solving them.

CCSS.MATH.PRACTICE.MP2 Reason abstractly and quantitatively.

CCSS.MATH.PRACTICE.MP3 Construct viable arguments and critique the reasoning of others.

CCSS.MATH.PRACTICE.MP4 Model with mathematics.

CCSS.MATH.PRACTICE.MP5 Use appropriate tools strategically.

CCSS.MATH.PRACTICE.MP6 Attend to precision.

CCSS.MATH.PRACTICE.MP7 Look for and make use of structure.

CCSS.MATH.PRACTICE.MP8 Look for and express regularity in repeated reasoning.