Y4-Monday-6th-Triangles-PPT.205521503.pptx

Y4-Monday-6th-Triangles-PPT.205521503.pptx

1. Triangle Is a polygon has only three sides

2. The first category Types of triangle according to sides

3. Introduction What is the same and what is different about these triangles? What is the name of each triangle? What do you know about it?

4. Introduction What is the same and what is different about these triangles? What is the name of each triangle? What do you know about it? Isosceles Has 2 sides of equal length. Equilateral Has 3 sides of equal length. Scalene Has 0 sides of equal length.

5. Varied Fluency 1 Tick the isosceles triangles. A B C D

6. Varied Fluency 1 Tick the isosceles triangles. A B C D ✓ ✓

7. Varied Fluency 2 Tick the equilateral triangles . A B C D

8. Varied Fluency 2 Tick the equilateral triangles . A B C D ✓ ✓

9. Varied Fluency 3 True or false? Connecting these dots will create a right angled triangle. A B C

10. Varied Fluency 3 True or false? Connecting these dots will create a right angled triangle. True A B C

11. Varied Fluency 4 Sort the triangles into the table. Scalene Isosceles Equilateral A B C D

12. Varied Fluency 4 Sort the triangles into the table. Scalene Isosceles Equilateral A B C D

13. Reasoning Which triangle is the odd one out? Why? A B C D

14. Reasoning Which triangle is the odd one out? Why? C because it is the only isosceles triangle. The rest are equilateral. A B C D

15. The second category Types of triangle according to angles

16. Introduction What is the type of these triangles according to angles? What is the name of each triangle? What do you know about it?

17. Introduction What is the same and what is different about these triangles? Acute All angles less than 90 .   right Has one angle = 90 .   Obtuse Has one angle more than 90 .  

18. Varied Fluency 1 Tick the right triangles . A B C D

19. Varied Fluency 1 Tick the right triangles . A B C D ✓ ✓

20. Varied Fluency 2 Tick the obtuse triangles . A B C D

21. Varied Fluency 2 Tick the obtuse triangles . A B C D ✓ ✓

22. Varied Fluency 2 Tick the acute triangles . A B C D

23. Varied Fluency 3 Tick the acute triangles . A B C D ✓

24. Varied Fluency 3 Tick the acute triangles . A B C D ✓

25. Final exercises Choose the correct answer 1-Measuring of an angle in triangle is 90 so this triangle is a/ an (acute – right – obtuse) 2-Measuring of an angle in triangle is 99 so this triangle is a/ an (acute – right – obtuse ) 3-Measuring of all angles in triangle is 6 so this triangle is a/ an (acute – right – obtuse ) 4 - The lengths of sides of a triangle are 4 , 4 and 5 cm , so this triangle is a / an (isosceles – scalene– equilateral ) 5 - The lengths of sides of a triangle are 4 , 4 and 4 cm , so this triangle is a / an (isosceles – scalene– equilateral )  

26. Final exercises Choose the correct answer 6- The lengths of sides of a triangle are 4.5 , 4.5 and 4 cm, so this triangle is a / an (isosceles – scalene– equilateral ) 7- A word refers to a triangle with an angle is more than ninety degree ( acute – right – obtuse ) triangle 8- An isosceles triangle measuring of its sides are 5, 4 and x cm , so x may = ………. cm (5– 6– 7) cm 9 - A type of triangle according to the lengths of its sides. (acute – scalene – obtuse ) 10 - A type of triangle according to the measuring of the angles. (isosceles – scalene– obtuse)