Lesson proper for base and height

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  • 1. Find out about Triangles
  • 2. Adapted from : Burns, M. (1994) The Greedy Triangle. USA
  • 3. What are the different parts of a triangle? BASE
  • 4.
    • HEI GHT
    What are the different parts of a triangle?
  • 5. Finding the base and height of a triangle
  • 6. The different types of triangles
    • Right Angled Triangles
    • Acute Angled Triangles
    • Obtuse Angled Triangles
    Right angle
  • 7. Similarities
    • All of them have 3 sides and 3 angles
    Differences
    • Right Angled Triangles - One has a right angle and two angles less than 90°
    • Acute Angled Triangles – One has three angles less than 90 °
    • Obtuse Angled Triangles – One has an angle greater than 90 ° and two angles less than 90 °
  • 8.  
  • 9. Let’s identify the base and height of a right angled triangle
  • 10.  
  • 11.  
  • 12. Let’s identify the base and height of n acute angled triangle
  • 13.  
  • 14.  
  • 15. Let’s identify the base and height of an obtuse angled triangle
  • 16.  
  • 17.  
  • 18. Think-Pair-Share
    • Draw a straight line on your Mini Whiteboard and label it base.
    • base
  • 19. Think-Pair-Share
    • Mark a point on top and within the length
    • of the line.
    • .
    • base
  • 20. Think-Pair-Share
    • 3. From the dot, extend a line to join to each side at end of the first line.
    • .
  • 21. Think-Pair-Share
    • 4. Pass it to your partner and get him/her to identify the height of the given triangle.
    • .
  • 22. Think-Pair-Share
    • Switch the role with your partner and repeat step1 to 6
  • 23. Level 2…
    • Draw another straight line on the Mini Whiteboard and label it base.
    • base
  • 24. Level 2…
    • 2. Mark another point on top but not within (outside) the length of the line.
    • .
    • base
  • 25. Level 2…
    • 3. From the dot, extend a line to join to
    • each side at end of the first line.
    • .
    • base
  • 26. Level 2…
    • 3. From the dot, extend a line to join to
    • each side at end of the first line.
    • .
    • base
  • 27. Level 2…
    • Pass the triangle you have drawn to
    • your partner and he/she will repeat the step 5 and 6 as in the previous triangle.
    • base