05 - Finding missing angles for Year 9 students

Lesson on finding missing angles in right angled triangles using trigonometry

1. Do Now Title: Finding Missing Angles Date: 03/12/2023 DATE, TITLE, SUBHEADING 1. Find the missing length of each triangle. 2. Find the scale factor in these pairs of similar shapes. 3. Simplify the expressions on these cards

2. Do Now Title: Finding Missing Angles Date: 03/12/2023 DATE, TITLE, SUBHEADING 1. Find the missing length of each triangle. 3. Simplify the expressions on these cards x = 6.63 cm (3s.f) x = 33.6 (3s.f) x = 2.08cm (3s.f) 2. Find the scale factor in these pairs of similar shapes. S.F =   S.F =   S.F =   -p -3p -15p

3. On your MWB ~~~~~~~~~~~~~~~~~~ Independent Practice Model Turn and Talk Title: Finding Missing Angles Date: 03/12/2023

4. Title: Finding Missing Angles Date: 03/12/2023 On your MWB ~~~~~~~~~~~~~~~~~~ Round these numbers to the nearest degree.      

5. Look at the equations. What do you notice? sin     tan     cos     Turn and Talk Title: Finding Missing Angles Date: 03/12/2023

6. sin     tan     cos     Turn and Talk Title: Finding Missing Angles Date: 03/12/2023 Look at the equations. What do you notice?

7. Complete the calculations without a calculator. sin     cos     sin     tan     Title: Finding Missing Angles Date: 03/12/2023 On your MWB ~~~~~~~~~~~~~~~~~~

8. Complete the calculations without a calculator. sin       cos       sin       tan       Title: Finding Missing Angles Date: 03/12/2023 On your MWB ~~~~~~~~~~~~~~~~~~

9. Use your calculator to find the value of to the nearest degree.   Model Title: Finding Missing Angles Date: 03/12/2023 sin  

10. Use your calculator to find the value of to the nearest degree.   Model Title: Finding Missing Angles Date: 03/12/2023 cos  

11. Use your calculator to find the value of to the nearest degree.   Model Title: Finding Missing Angles Date: 03/12/2023 tan  

12. Use your calculator to find the value of to the nearest degree.   Title: Finding Missing Angles Date: 03/12/2023 On your MWB ~~~~~~~~~~~~~~~~~~ sin   cos   tan  

13.   m   Work out the size of the angle marked Give your answer to decimal place.   m   Model Title: Finding Missing Angles Date: 03/12/2023

14.   cm   cm   Work out the size of the angle marked Give your answer to the nearest degree.   Model Title: Finding Missing Angles Date: 03/12/2023

15. Title: Finding Missing Angles Date: 03/12/2023 On your MWB ~~~~~~~~~~~~~~~~~~ Work out the size of the angle marked Give your answer to the nearest degree.   Which inverse trigonometric function do we need to use?

16. Title: Finding Missing Angles Date: 03/12/2023 On your MWB ~~~~~~~~~~~~~~~~~~ Work out the size of the angle marked Give your answer to the nearest degree.   Which inverse trigonometric function do we need to use?

17. Title: Finding Missing Angles Date: 03/12/2023 On your MWB ~~~~~~~~~~~~~~~~~~ Work out the size of the angle marked Give your answer to the nearest degree.   Which inverse trigonometric function do we need to use?

18. Title: Finding Missing Angles Date: 03/12/2023 On your MWB ~~~~~~~~~~~~~~~~~~ Work out the size of the angle marked Give your answer to the nearest degree.   Which inverse trigonometric function do we need to use?

19. Title: Finding Missing Angles Date: 03/12/2023 On your MWB ~~~~~~~~~~~~~~~~~~ Work out the size of the angle marked Give your answer to the nearest degree.   Which inverse trigonometric function do we need to use?

20. Title: Finding Missing Angles Date: 03/12/2023 On your MWB ~~~~~~~~~~~~~~~~~~ Work out the size of the angle marked Give your answer to the nearest degree.   Which inverse trigonometric function do we need to use?

21. Title: Finding Missing Angles Date: 03/12/2023 On your MWB ~~~~~~~~~~~~~~~~~~ Work out the size of the angle marked Give your answer to the nearest degree.   Which inverse trigonometric function do we need to use?

22. Title: Finding Missing Angles Date: 03/12/2023 On your MWB ~~~~~~~~~~~~~~~~~~ Work out the size of the angle marked Give your answer to the nearest degree.   Which inverse trigonometric function do we need to use?

23. cm     cm   O H cm   How many ways can you calculate the missing angle? sin   sin         cos   cos         tan   tan         A H O A Turn and Talk Title: Finding Missing Angles Date: 03/12/2023

24. Independent Practice Title: Finding Missing Angles Date: 03/12/2023

25. Title: Finding Missing Angles Date: 03/12/2023