1. Play a round of Which One?

   Partner A: Choose one of these quadrilaterals. Do not tell or show your choice.

   Partner B: Ask yes or no questions to determine which shape your partner chose. After each question, cross off or cover quadrilaterals based on your partner’s answer.

   

   

   8 quadrilaterals. 2 sets parallel sides, opposite sides equal, angles appear to be right. 2 sets of parallel sides, opposite sides equal. 1 set parallel sides, 1 right angle. 1 set of parallel sides. no parallel sides. no parallel sides, sides labeled 4, 4, 7, 7. 1 set of parallel sides, other two sides each labeled 3. 2 sets of parallel sides, all sides appear to be same length, all angles appear to be right. 

   

   5 quadrilaterals. Left to right, First, 2 sets of parallel sides, opposite sides, equal length. Second, no parallel sides. Third, no parallel sides. Fourth 2 sets of parallel sides, all sides equal, all right angles. Fifth no parallel sides, looks like a arrowhead.

   Use this space to record your questions for this round.

2. Han and Mai play Which One? Han chooses one of these two shapes. What question can Mai ask to determine which shape Han chose?

   

If you have time: Switch roles and play another round of Which One?

Your teacher will give you a set of cards that show quadrilaterals.

1. Sort the cards into at least 2 categories of your choosing. Be ready to explain the meaning of your categories.

   (Pause for teacher directions.)

2. Sort the cards into at least 2 categories using parallel lines. Be ready to explain the meaning of your categories.