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# Lesson proper for base and height

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### Lesson proper for base and height

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