The document discusses the different types and parts of triangles. It defines the base and height of triangles and explains that there are three main types of triangles: right triangles with one 90 degree angle, acute triangles with all angles less than 90 degrees, and obtuse triangles with one angle greater than 90 degrees. It provides instructions for identifying the base and height of sample triangles on a mini whiteboard by drawing lines between points.

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 °

9. Let’s identify the base and height of a right angled triangle

12. Let’s identify the base and height of n acute angled triangle

15. Let’s identify the base and height of an obtuse angled triangle

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