1. Trigonometry rules
Sunday, 28 July 2019

2. The General Triangle C B A

3. The General Triangle a C B A

4. The General Triangle a C B b A

5. The General Triangle a C B c b A

6. The Sine Rule A B C c a b

7. Example
Find 𝑎 in the triangle below a
8 cm
27
110

8. Find c in the triangle below
Example
Find c in the triangle below c
7 cm
60
50

9. First we must find this angle using angles in a triangle angle = 86⁰
Example
Find 𝑥 in the triangle below x
10.6 cm
54
40
First we must find this angle using angles in a triangle angle = 86⁰

10. Example
Find 𝑏 in the triangle below
84
12 cm
63
33 b

11. Find the size of angle B in the triangle below
Example
Find the size of angle B in the triangle below
15cm
120 A B C
6cm
Similar to the previous question the information provided only allows us to find angle C first

12. Find the size of angle A in the triangle below
Example
Find the size of angle A in the triangle below
24cm
70 A B C
27cm

13. Find the size of angle R in the triangle below
Example
Find the size of angle R in the triangle below
18.5cm
85 Q P R
10.5cm