Day 7 Quadrilaterals

 Do you know what a quadrilateral is? These are quadrilateralsThese 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 IIn what ways are all quadrilaterals alike? AAll have 4 sides and angles DDifferent? NNot all sides or angles are the same T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 Trapezoids with right angles Other trapezoids

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)