How many bricks have 2 pairs of parallel sides?

1. Find the quadrilaterals that have each of the following attributes. Record their letter names here.

   attribute	quadrilaterals with the attribute
   a. no right angles
   b. only 1 pair of parallel sides
   c. only 1 pair of perpendicular sides
   d. same length for all sides
   e. same size for all angles
   f. same length for only 2 sides
   g. no parallel sides
   h. 2 obtuse angles

2. Choose 1 sentence to complete based on your work.

   1. I noticed some quadrilaterals . . .
   2. I noticed that all quadrilaterals . . .
   3. I noticed that no quadrilaterals . . .

If you have time: Do you think it’s possible for a quadrilateral to have:

• More than 2 acute angles?
• More than 2 obtuse angles?
• Exactly 3 right angles?

If you think so, sketch an example. If you don’t think so, explain or show why you think it’s impossible.

Here are 4 sets of quadrilaterals.

Write 4–5 statements about the sides and angles of the quadrilaterals in each set. Each statement must be true for all the shapes in the set.

Partner A:

• Record an attribute that a quadrilateral could have. Don’t show it to your partner.  
• Find 3 quadrilaterals that have that attribute and 3 that don’t. Record each quadrilateral’s letter name in the correct column of the table.

Partner B:

• Study the quadrilaterals chosen by your partner.
• Pick another quadrilateral. Ask: “Does this quadrilateral have the attribute?”
• Find at least 1 quadrilateral that has the attribute and 1 that does not have it.
• Guess the attribute. If your guess is incorrect, ask more questions before guessing again.

Switch roles after the attribute is guessed correctly.

• Partner A’s attribute:

have the attribute	do not have the attribute

• Partner B’s attribute:

have the attribute	do not have the attribute