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21 st Century Lessons

21 st Century Lessons. Area of a Triangle Lesson. Mrs.Thompson Level 1. Lesson Overview (2 of 3). Lesson Overview (3 of 3). Warm Up. OBJECTIVE: SWBAT develop and apply a strategy for finding the area of any triangle in the world.

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21 st Century Lessons

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  1. 21st Century Lessons Area of a Triangle Lesson Mrs.Thompson Level 1

  2. Lesson Overview (2 of 3)

  3. Lesson Overview (3 of 3)

  4. Warm Up OBJECTIVE: SWBAT develop and apply a strategy for finding the area of any triangle in the world. 1. Joel bought a giant candy bar and shared the outlined piece with his sister. What is the area of the piece of the candy bar he shared? 15.6 in Area of Rectangle - > 12 in x 10 in = 120 in2 Area of Triangle - > 120 in2 ÷ 2 = 60 in2 10 in 2. Joel’s friend bought an even bigger candy bar. Find the area of a right triangular candy bar that has a base of 5 ¼ ft. and a height of 4 ft. 12 in Agenda

  5. Agenda: OBJECTIVE: SWBAT develop and share a strategy for finding the area of any triangle in the world. 1.) Warm Up 2.) Launch– Finding the Area of ANY Triangle 3.) Explore:– Partner Activity 4.) Summary – Whole Class Share-Out 5.) Practice – Interleaving 6.) Assessment – Ticket to Leave Agenda

  6. Getting Ready -Triangles Everywhere…. Agenda

  7. Launch – Think, Pair, Share What strategy did you use to find the area of a parallelogram? Decomposing height = 4 cm Composing base = 8 cm base = 8 cm 7 cm 1 cm . Agenda

  8. Launch – Think, Pair, Share Remember:The area of the right triangles were Half the Area of the Surrounding Rectangles 9 ft. 5 ft. Agenda What was the best strategy for finding the area of a right triangle?

  9. Launch This is the kind of triangle we worked with yesterday Today we’ll work with these triangles What’s different about these triangles? Do you think it will be harder to find the area? Explain. Agenda

  10. Explore – Partner Activity Find the area of the triangles and respond to the questions on your handout. Time: 8 minutes to complete this activity Click on watch for timer Agenda

  11. Summary – Whole Class Share-Out 1.) What strategy did you use to find the area of a triangle? 2.) What’s different about the surrounding rectangles for problems 5 & 6? Agenda

  12. Practice – Finding the Base and the Height Teacher: Identify Dimensions Base? Height? Height Base Agenda

  13. Practice – Finding the Base and the Height Student – Identify Dimensions Base? Height? Height Base Agenda

  14. Practice – Finding the Base and Height Teacher – Identify Dimensions Base? Height? Height Base Agenda

  15. Practice – Finding the Base and Height Student – Identify Dimensions Base? Height? Height Base Agenda

  16. Teacher Practice – Finding Area The Formula for finding the Area of Any Triangle is Height Base height base Agenda

  17. Interleaving - Teacher Example (Students copy) Use the formula to find the area of a triangle h= 5 in. b= 8 in. Agenda

  18. Interleaving – Student Practice Use the formula to find the area of a triangle 7 in. 11 in. 6 in. Agenda

  19. Interleaving - Teacher Example (Students copy) Use substitution to find area. 9 ft. 4 ft. Agenda

  20. Interleaving – Student Practice Use substitution to find the area. 20 in. 20 in. Agenda

  21. Mini Lesson – Formulas for Area of a Triangle Agenda

  22. Mini-Lesson – Let’s Test the Formulas 3 in 4 in A = ½ (4)(3) A = ½ (12) (Hint: Think – what’s half OF 12?) A = 6 in 2 Agenda

  23. Summarize What is the formula for finding the area of ANY triangle in the world? or Agenda

  24. Assessment - Ticket to Leave - Journal 1.) Juan said that he could find the area of a pool ball rack by only using the side lengths. Miguel disagreed. Explain who’s right. 2.) If the base of a given triangle is 6 in and the height is 4 in, what is the Area? Show or explain your work. Agenda

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