Lesson 12.3 Name Reteach Identify Polygons You can identify and name polygons by the number of sides and angles they have. 3 sides 4 sides 5 sides 3 angles 4 angles 5 angles triangle quadrilateral pentagon 6 sides 8 sides 10 sides 6 angles 8 angles 10 angles hexagon octagon decagon Describe and name this shape. Describe and name this shape. It has 4 sides. It has 6 sides. It has 4 angles. It has 6 angles. It is a quadrilateral. It is a hexagon. Write the number of sides and the number of angles. Then name the polygon. 1. 2. sides sides angles angles Chapter Resources 12-9 Reteach © Houghton Mifflin Harcourt Publishing Company DO NOT EDIT--Changes must be made through “File info” CorrectionKey=A MATH ShareShare andand ShowShow BOARD Look at the quadrilateral at the right. 1. Outline each pair of opposite sides that are parallel with a different color. How many pairs of opposite sides appear to be parallel? __ 2. Look at the parallel sides you colored. Think: All the angles are The sides in each pair are of __ length. right angles. 3. Name the quadrilateral in as many ways as you can. ____ Circle all the words that describe the quadrilateral. 4. 5. 6. rectangle rhombus rectangle rhombus quadrilateral rhombus square square trapezoid trapezoid rectangle quadrilateral Math Talk Math Processes and Practices 1 OnOn YourYour OwnOwn Analyze How can you have a rhombus that is Circle all the words that describe the quadrilateral. not a square? 7. 8. 9. rectangle rectangle quadrilateral trapezoid rhombus square quadrilateral trapezoid rectangle rhombus square rhombus © Houghton Mifflin Harcourt Publishing Company 724 DO NOT EDIT--Changes must be made through “File info” CorrectionKey=A Name ProblemProblem SolvingSolving •• ApplicationsApplications Use the quadrilaterals at the right for 10–12. 10. Which quadrilaterals appear to have 4 right angles? D D D E E E 11. Which quadrilaterals appear to have 2 pairs of opposite sides that are parallel? A A A B B B C C C 12. Which quadrilaterals appear to have no right F F F angles? Write all or some to complete the sentence for 13–18. 13. The opposite sides of _ rectangles 14. _ sides of a rhombus are the are parallel. same length. 15. _ squares are rectangles. 16. _ rhombuses are squares. 17. _ quadrilaterals are polygons. 18. _ polygons are quadrilaterals. Math Processes 19. and Practices 6 Circle the shape at the right that is not a quadrilateral. Explain your choice. 20. SMARTER I am a polygon that has 4 sides and 4 angles. At least one of my angles is less than a right angle. Circle all the shapes that I could be. © Houghton Mifflin Harcourt Publishing Company quadrilateral rectangle square rhombus trapezoid Chapter 12 • Lesson 5 725 Real-world Quadrilaterals Name: ______________________________ Find two examples of each quadrilateral in your home or outside and name them. Quadrilateral Name of objects Square Rectangle Rhombus Trapezoid Other Lesson 12.6 Name Reteach Draw Quadrilaterals Use grid paper to draw a quadrilateral. Step 1 Use a ruler to draw line segments. Connect A to B. B Step 2 Connect B to C. A C Step 3 Connect C to D. D Step 4 Connect D to A. Write the name of your quadrilateral. rhombus or trapezoid 1. Choose four endpoints, and connect 2. Choose four endpoints, and connect them to make a square. them to make a trapezoid with only 1 pair of opposite sides that are parallel. Use grid paper to draw a quadrilateral that is described. Name the quadrilateral you drew. 3. 4 right angles 4. 2 pairs of opposite sides that are parallel Chapter Resources 12-15 Reteach © Houghton Mifflin Harcourt Publishing Company Multiplication RACE One player: 1) Roll a dice two times. 2) Multiply the two numbers. 3) This will be your first round score. 4) Repeat steps 1-2 for each round and add the product to your score from the previous round. 5) Keep playing until your total sum reaches 1,000 or more. **Try it again by rolling two dice and adding the numbers to make each factor.** Two (or more) players: 1) Roll a dice two times. 2) Multiply the two numbers. 3) This will be your first round score. 4) Repeat steps 1-2 for each round and add the product to your score from the previous round. 5) First person whose total sum reaches 1,000 or more W INS. **Try it again by rolling two dice and adding the numbers to make each factor.** If you don't have dice, you can flip two playing cards and multiply those, or you can create your own cards. (Cut up pieces of paper and number each piece 0-12). Multiplication WAR **You will need a deck of playing cards/UNO cards.** Two (or more) players: 1) Deal half the cards to each player (keep them face down). 2) Each player will f lip their top two cards. 3) Multiply the two numbers on these cards. (A=1, J=11, Q=12, K=13) 4) Whoever has the greater product gets all cards from that round. 5) Play 10-20 rounds. 6) At the end of the last round, each player counts their cards. Whoever has more cards WINS. .