Students will use their prior knowledge about perimeter and area to distinguish between them and recognize them as attributes of rectangles. Students will use their understanding that shapes have a number of sides to categorize them. These attributes will be used by students to recognize that shapes can fit into categories and subcategories based on designated attributes.
Key Concepts:
 Perimeter is a linear attribute of plane figures and can be distinguished from area.
 Shapes in different categories (rhombuses, rectangles, etc.) may share attributes.
 All rhombuses, rectangles and squares are examples of quadrilaterals, but not all quadrilaterals fit in those subcategories.
Prior Knowledge Needed:
 Reason with shapes and their attributes. Recognize and draw shapes having specified attributes, such as a given number of angles or a given number of equal faces. Identify triangles, quadrilaterals, pentagons, hexagons, and cubes; (Grade 2, Unit 10; 2.G.A.1)
 Recognize area as an attribute of a plane figure and understand the concepts of area measurement; (Grade 3, Unit 2; 3.G.C.5)
 Relate area to the operations of multiplication and addition; (Grade 3, Unit 2; 3.G.C.7)
 Recognize perimeter as an attribute of plane figures and distinguish between linear and area measures; (Grade 3, Unit 3; 3.MD.D)
 Solve real world problems involving the perimeter of polygons, including finding the perimeter given side lengths; (Grade 3, Unit 3; 3MD.D.8)
Units on the Horizon:
 Using multiplication and division strategies with larger numbers (Grade 4, Unit 2)
 Angle measurement (Grade 4, Unit 10)
Lessons

Lesson objective: Understand that perimeter is a linear attribute of plane figures and can be distinguished from area. Students bring prior knowledge of area from 3.MD.C. This prior knowledge is extended to solving problems as students distinguish betwe...

Lesson objective: Find the area and perimeter of a plane. This lesson helps to build procedural skill with caluclating the perimeter and area of a plane figure. A rectangle is used here because it provides a predictible process. This work develops stude...

Lesson objective: Determine the length of an unknown side of a shape when the length of the other sides and perimeter are given. This lesson helps to build fluency with understanding perimeter. Rectangles and other polygons are used here because perimet...

Lesson objective: Solve problems that require students to distinguish between area and perimeter. This lesson provides an opportunity for students to apply their knowledge and understanding of area and perimeter to a reallife situation. Students are as...

Lesson objective: Understand that shapes in different categories (rhombuses, rectangles, etc.) may share attributes. Students bring prior knowledge of attributes of shapes from 2.G.A. This prior knowledge is extended to understanding that shapes my shar...

Lesson objective: Understand that shapes in different categories may share attributes, and that shared attributes can define larger categories. This lesson helps to build fluency with recognizing attributes of shapes. Polygons are used here because they...

Lesson objective: Understand that shapes have attributes that can be identified. Students bring prior knowledge of attributes from 2.G.A. This prior knowledge is extended to comparing figures as students identify similar and different attibutes among sh...

Lesson objective: Identify attributes of quadrilaterals, and use them to compare shapes. This lesson helps to build fluency with recognizing attributes of shapes. Two dimensional figures are used here because they clearly illustrate the attributes. This...

Lesson objective: Analyze the attributes of a shape to assess whether they fit in a category. This lesson helps to build fluency with recognizing attributes of a shape. Plane figures are used here because they allow for discrimination between quadrilate...

Lesson objective: Understand that shapes may share some attributes with other shapes in different categories. This lesson provides an opportunity for students to apply their knowledge and understanding of common attributes to a mathematical situation. S...