Day 7
Quadrilaterals
Quadrilaterals
 Do you know what a quadrilateral is?
These are quadrilaterals
These are not quadrilaterals
Students identify a quadrilateral
 How do you know that a shape is a
quadrilateral?
 What are the properties of quadrilaterals?
 In your group, identify as many quadrilaterals
as you can, there should be 12 different ones
in all.
Analyzing quadrilaterals
 In what ways are all quadrilaterals
alike?
 All have 4 sides and angles
 Different?
 Not all sides or angles are the same
 Think of ways you have seen
quadrilaterals used in the school
building’s design?
What about in the classroom?
Time to sort!
Need: 2D shapes, white boards, and black
markers
 Take the 12 quadrilaterals and sort them
into groups on your white board.
 Come up with a rule for why you put the
shapes together. What characteristic do
they each share.
 Label the groups with the rule you made.
 Share with class.
Analyzing Quadrilaterals
Ways to sort quadrilaterals:
Rectangles and Not rectangles
Shapes with and without right angles
Large, medium, and small
4 right angles, 2 right angles, no right
angles
Parallel sides and no parallel sides
What did you learn by sorting or from
classmates?
 What does parallel mean?
 Sort the groups according to the number of
parallel sides.
 How many groups do you have?
 How many are in each group?
Parallelogram…
 What is a parallelogram?
 A quadrilateral with two pairs of parallel
sides.
Parallelograms
Rectangles
Rhombuses
Other parallelograms
Rectangles are quadrilaterals with four right angles
Rhombuses are quadrilaterals with four equal sides
Squares are parallelograms with four right angles and four equal sides
Trapezoids
What rule could you come up with for each of the following
groups?
?
?
Trapezoids
a quadrilateral with exactly one pair of parallel sides
Isoceles trapezoids
Other
trapezoids
Trapezoids
with right
angles
Now examine your shapes with no pairs
of parallel sides and describe them
Why is this shape a quadrilateral?
Why doesn’t it fit into any of the other
groups of quadrilaterals?
No parallel sides
Using polystraws
 Create at least one quadrilateral per
person that is not like one of the
magnets in the set.
 You need to be able to describe your
shape and explain to which group of
quadrilaterals it belongs to.
Journal page 10
 Analyzing and Describing Quadrilaterals.
 With your group come up with a
chart/table/graphic organizer to show and
describe the different types of
quadrilaterals.
 Share with class
How did you describe similarities and differences of
squares, rectangles, and rhombuses?
For Homework
 Create a
using at least 7, 2D shapes
with each shape labeled, and 3 different
types of angles labeled with the shapes
(acute, right, obtuse, or straight)