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# 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