The document shows several triangles with labeled sides and angles. The triangles have unknown angles or sides labeled with "x". This indicates the document is providing examples of when to use the Sine Rule or Cosine Rule to solve for unknown values in right and oblique triangles. The Sine Rule and Cosine Rule are trigonometric methods used to solve for a single unknown given other known values in a triangle.

1. Sine Rule or Cosine Rule?
R
60 ̊
x cm
40 ̊
T
12 cm
V

2. Sine Rule or Cosine Rule?
D
20 ̊
20 cm
120 ̊
E F
x cm

3. Sine Rule or Cosine Rule?
N
40 cm
20 cm
x ̊
M O
25 cm

4. Sine Rule or Cosine Rule?
X
25 ̊
7 cm
Y
15 cm
x cm
Z

5. Sine Rule or Cosine Rule?
J
x ̊ 8 cm
H
60 ̊
P
9 cm

6. Sine Rule or Cosine Rule?
G
x cm
4 cm
B
45 ̊
U

7. Sine Rule or Cosine Rule?
P
9 cm 70⁰ 15 cm
60⁰
Q 50⁰
x
R