Previous Lesson
The lesson prior to this lesson the students were given this picture. It is a cube. Points P and Q are the midpoints of the sides.
The students were asked "What kind of quadrilateral is PQGF?" The students used nets to think it through. I wasn't present for this lesson so I don't know the details of this lesson. It turns out that PQGF is a rectangle.
This Lesson
Then in this class, the students were given this picture. Points P and Q are the midpoints of the sides.
The question that was asked to the students is "What kind of quadrilateral is DQFP?" The students were given time individually to think about it, and then the teacher asked students to raise their hand based on what shape they thought it was. The common answers were square and rhombus, but there were students who thought it was a rectangle, parallelogram. I was impressed that no student was concerned of the social implications of their initial guess. I think that if I asked this question to my students, many students would vote how the few "smart" students vote. I was impressed that students felt safe enough to voice their thoughts, even if they were the only ones.
After students made their initial guess, the students got in groups of 3 in their han. (Their han is a grouping of about 6 students. These groups are set at the beginning of the year and are the same throughout the entire year). Since students had different opinions, they were to discuss their reasoning and as a group decide on what shape they thought it was and why. The students were also given the following net:
As they were reasoning, they were invited to use that net. Some students drew the shape they thought the lid was and then cut it out to see if it matched. For example the groups that thought it was a square constructed a square on the net and then cut it out. Or I saw one group who thought it was a rhombus, construct a rhombus of two equilateral triangles and see if it matched. Neither of these worked. I saw another group cut out the net as shown, then place the lid face down on another piece of paper and trace the top.
At the end of the lesson the teacher didn't announce what the shape is. I was really impressed by this. If I was teaching this lesson I would want to wrap it up and say what the answer is. The truth is, if the teacher did give the answer at the end a two things would happen:
- The students would stop thinking about the problem. If the teacher doesn't announce it, there will be students to continue thinking about the problem on their own and may come up with an answer or other connections.
- The next task that the teacher presented, the students would be significantly less motivated to attempt it because they would know that if they wait until the end of the lesson, the teacher will tell them the answer anyway.
My Reflection
I loved this task! It was very simple to understand, but very complex to solve. I loved that it was open on how to answer the question.
I love research lessons! I wish that I could find more lessons like this to use in my class, with my students.


