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# 10.4 And 10.5

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### 10.4 And 10.5

1. 1. 10.4 Triangles 10.5 Quadrilaterals Identify and Classify Triangles and Quadrilaterals
2. 2. P 428 Hands-on Mini Lab First—Watch the demonstration <ul><li>Use a straightedge to draw a triangle with three acute angles. Label the angles A, B, and C. Cut out the triangle. </li></ul><ul><li>Fold angle B so that its vertex touches the line between angles A and C. The fold should be parallel to the base of the triangle. </li></ul><ul><li>Fold angle A and angle C so the vertices meet. </li></ul>
3. 3. Questions for mini lab <ul><li>What kind of angle is formed where the three vertices meet? </li></ul><ul><li>Repeat the activity with another triangle. </li></ul><ul><li>Make a conjecture about the sum of the measures of three angles of any triangle. </li></ul>
4. 4. A triangle has ___ angles. The angles add to give you ____. 1 2 3
5. 5. Find x 32 ° x 64 °
6. 6. Bermuda Triangle
7. 7. P 428 example 1
8. 8. p 429 example 2
9. 9. An airplane has winds that are shaped like triangles. Find the missing measure. <ul><li>(In class example 1) </li></ul>
10. 10. In class example 2
11. 11. Properties of triangles video
12. 12. In groups talk about the four types of triangles mentioned in the video.
13. 13. Classify by ANGLES Acute Triangle Right Triangle Obtuse Triangle ____ angles are _______ 90 ° ____angles are _______ 90° ____angles are _______ 90°
14. 14. Classify by Sides Scalene Triangle Isosceles Triangle Equilateral Triangle ____ congruent sides ____ congruent sides ____ congruent sides
15. 15. Classify the triangle by its angles and by its sides
16. 16. Classify the triangle by its angles and by its sides
17. 17. Classify the triangle by its angles and by its sides
18. 18. Classify the triangle by its angles and by its sides
19. 19. P 429 example 3 and 4
20. 20. Workbook 10-4
21. 21. <ul><li>Turn and Talk </li></ul><ul><li>What does quad mean? </li></ul><ul><li>What is a quadrilateral? </li></ul>10-5 Quadrilaterals
22. 22. Quadrilateral Parallelograms Trapezoid Rectangle Rhombus Square
23. 23. Classify the quadrilateral using the name that best describes it.
24. 24. Classify the quadrilateral using the name that best describes it.
25. 25. Quadrilateral Video
26. 26. Classify the quadrilateral using the name that best describes it.
27. 27. Classify the quadrilateral using the name that best describes it.
28. 28. Angles <ul><li>Divide the parallelogram into 2 triangles. </li></ul><ul><li>What is the sum of angles in both triangles? </li></ul><ul><li>Then what is the sum of angles in the parallelogram? </li></ul>
29. 29. P 435: example 3
30. 30. In class example 3
31. 31. More examples from workbook
32. 32. Quadrant Card—Fill in the top 2 quadrants. Then exchange with a partner and fill in the bottom 2. Draw a picture and name the quadrilateral described above. Draw a picture and name the triangle described above. Without giving it’s name, describe one type of quadrilateral. Without giving it’s name, describe one type of triangle.
33. 33. Homework <ul><li>p 430: 2, 5-23 and p 435: 4-6, 10-23 </li></ul><ul><li>DUE FRIDAY!!! </li></ul>