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 Shape Letters Definition acute triangle equilateral triangle scalene triangle isosceles triangle obtuse triangle octagon parallelogram pentagon quadrilateral rectangle rhombus right trapezoid hexagon square

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”