Lesson 9

Sorting 3-D Shapes

Est. Class Sessions: 2–3

Summarizing the Lesson

Ask selected students to share their geometry riddles with the class one clue at a time. Have other students share their strategies for determining which 3-D shapes fit the given clue.

To guide the discussion, ask questions similar to the following:

Which 3-D shapes fit the first clue?
After the second clue, which shapes did you eliminate?
Was there only one shape that fit the riddle?
What other clues could you add to this riddle?