Lesson 5

Plotting and Describing Shapes

Est. Class Sessions: 2–3

Summarizing the Lesson

Use the triangle and quadrilateral shape cards from the lesson to play Name That Property. Make a two-column table. Label the columns “Yes” and “No.”

Tell students:

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  • Watch carefully as I sort shapes into two sets, one shape at a time. If a shape has my secret property, I will put it in the “Yes” column. If a shape does not have the property, I will put it in the “No” column.
  • Do not guess out loud. When you think you know the property, find a shape that also belongs in the “Yes” column. Raise your hand, and I will ask you to place it in the column silently. When several shapes have been added correctly, we will name the property.

Figure 2 shows a possible table for the property, “All angles are equal.” If there is not a single shape available that matches the rule, students can make a sketch of a polygon. Have students challenge one another. Possible rules include:

  • Has a right angle
  • Has an obtuse angle
  • Is a quadrilateral
  • Is a triangle
  • All sides are equal
  • All sides and all angles are equal
  • Has at least one set of parallel sides
  • Has only one set of parallel sides
  • Has no right angles
  • Has two sets of parallel sides

Assign Questions 1–10 in the Homework section of the Student Guide.

Student Guide:
Student Activity Book:
Master:
Shapes sorted for the rule, "all angles are equal"
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