1. Cosine Rule – Lengths – 3 Stars
In this activity, 2 teams compete to place 3 stars in a row on the game board.
Click/Touch a grid square to go to the corresponding question.
Click the ‘Answer’ box for the answer and again to return to the game board.
Click the colour of the team to place a star in that square.
This game has sound!

2. This game is flexible and can be run in a variety of ways:
Teams could choose questions individually, with the opportunity for
the other team to ‘steal’ if their answer is incorrect.
A whole team may complete a question with one student
being chosen to provide an answer.
Individual students from each team may compete
simultaneously for a quickest answer.
Red/Blue team students can be paired. The teacher can then either assess
which majority of a team got their answer correct fastest (using mini-whiteboards)
or poll the class as to how many red/blue team members won within each pair, and therefore determine the overall winning team.

3. 3 Stars

4. First team to get
3 stars in a row
wins!

5. A B C D 1 1 2 2 3 3 4 4

6. Find 𝑥:
9 cm
105°
8 cm 𝑥
( 1dp)
13.5 cm
Answer

7. Find 𝑥:
9 cm
7 cm
124° 𝑥
( 1dp)
14.2 cm
Answer

8. Find 𝑥: 𝑥
8 cm
59°
10 cm
( 1dp)
Answer
9.0 cm

9. Find 𝑥:
6 cm
85°
4 cm 𝑥
( 1dp)
6.9 cm
Answer

10. Find 𝑥:
11 cm
42°
10 cm 𝑥
( 1dp)
7.6 cm
Answer

11. Find 𝑥:
7 cm
111°
13 cm 𝑥
( 1dp)
16.8 cm
Answer

12. Find 𝑥:
5 cm 𝑥
65°
6 cm
( 1dp)
Answer
6.0 cm

13. Find 𝑥:
7 cm
103°
5 cm 𝑥
( 1dp)
9.5 cm
Answer

14. Find 𝑥:
6 cm 𝑥
38°
10 cm
( 1dp)
Answer
6.4 cm

15. Find 𝑥:
37°
13 cm
15 cm 𝑥
( 1dp)
Answer
9.1 cm

16. Find 𝑥:
3 cm 𝑥
28°
7 cm
( 1dp)
Answer
4.6 cm

17. Find 𝑥:
14 cm
46°
10 cm 𝑥
( 1dp)
10.1 cm
Answer

18. Find 𝑥:
6 cm
87°
5 cm 𝑥
( 1dp)
7.6 cm
Answer

19. Find 𝑥:
7 cm 𝑥
76°
9 cm
( 1dp)
Answer
10.0 cm

20. Find 𝑥: 𝑥
6 cm
48°
8 cm
( 1dp)
Answer
6.0 cm

21. Find 𝑥:
12 cm
68°
10 cm 𝑥
( 1dp)
12.4 cm
Answer

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