Download Compare and Contrast Polygons Unit 4, Lesson 3

Warm Up
• Rachel and Sierra were comparing the lids of their
jewelry boxes. Rachel and Sierra both argued
that only their lid had at least one set of
perpendicular diagonals. Sandra was listening to
the girls discuss their lids and had them use yarn
to make diagonals on them. She noticed both
girls had lids that had all sides congruent. With
Sandra’s help the girls realized that they both had
lids with at least one set of perpendicular
diagonals. What are the possible lids the girls
may have had on their jewelry boxes?
Compare and Contrast Polygons
Unit 4, Lesson 3
Let’s Review Triangles
The Triangle Song
Vocabulary
• Perpendicular lines - lines that form 90°
angles when they intersect (cross)
• Parallel lines – lines that are equal distance
apart and never touch
Vocabulary
• Congruent – same size, same shape
Vocabulary
• Quadrilateral - a polygon with four sides
Vocabulary
• Parallelogram - a polygon with two pairs of
parallel sides
• A rectangle is a parallelogram
• A rhombus is a parallelogram
• A square is a parallelogram
Vocabulary
• Square - a parallelogram with all sides the
same length and all right angles
– Diagonals are congruent
– Diagonals are perpendicular
– A quadrilateral
Vocabulary
• Rectangle - a parallelogram with all right
angles
– Diagonals are congruent
– Opposite sides are congruent
Vocabulary
• Rhombus - a parallelogram with all sides the
same length
• Diagonals are NOT congruent
• Diagonals are perpendicular
Vocabulary
• Trapezoid – a quadrilateral with ONLY one pair
of parallel sides
• Right trapezoid - a trapezoid with right angles
Vocabulary
• Pentagon - a polygon with five sides
Vocabulary
• Hexagon - a polygon with six sides
Vocabulary
• Octagon – a polygon with eight sides
Compare Polygons
• What is similar and different about these two shapes? Use
precise vocabulary!! 
Activity Book
• Cut out shapes on page 162A in your activity book
• DO NOT cut the actual shape…cut only the boxes
• Use these shapes to complete the table on Day 41,
“Comparing Polygons Table”
• Record the attributes and definitions of each shape
• In the ‘Shape Letters’ column, write letters of the
shapes that correspond with the vocabulary word!
• The chart is on the next slide! 
Name
acute triangle
equilateral triangle
scalene triangle
isosceles triangle
obtuse triangle
octagon
parallelogram
pentagon
quadrilateral
rectangle
rhombus
right trapezoid
hexagon
square
Shape Letters
Definition
Find Day 41, “Polygon Capture Rules of
the Game”
Before You Play:
Cut up the Polygon Capture Cards, shuffle and place face down. Take one persons
shapes from page 162A and place them face up all around the deck of cards.
How to Play:
1. Player 1 turns over one card from the deck. All polygons that match both these
properties may be captured. Captured polygons are removed from play and placed
beside player 1.
2. If player 1 has missed any figures, player 2 may now capture them.
3. Player 2 chooses a card from each deck and tries to capture polygons.
If no polygons can be captured with the card chosen, the player may choose one more
card from the deck. If no polygons can then be captured, that turn is over.
A player may challenge the opponent's capture. If the piece was incorrectly chosen, it
is put back in play in the center. Play until two or fewer polygons remain. If you run
out of cards, reshuffle the deck. The player with the most polygons wins.
Rules Continued
Steal Card:
If you select the Steal Card, pick two properties, one for sides and one for angles, that
will allow you to steal as many polygons from your opponent as possible. Make up
these properties on your own. If your opponent has no cards to steal, put the Steal
Card back in the angle deck and your turn ends.
Example:
Player 1 turns over the card At least one angle is a right angle and only one pair of
sides are parallel.
Player 1 captures shape P.
Player 2 may now capture shape H, since it was missed by player 1.
Player 2 now turns over a card.
Remaining Time/Homework
• Day 41, “Compare Polygons Journal
Prompt”
• Day 41, “Comparing Polygons
Homework”