Skip to content
Toggle Sidebar
Pricing
Home
Subjects
Past Papers
Key Terms
My Courses
Select your courses
4.2.9 Sine and Cosine Rules — Edexcel Mathematics 1MA1 | GradeGen.AI
Mathematics
Geometry and Measures
Mensuration and Calculation
Sine and Cosine Rules
Sine and Cosine Rules
Edexcel GCSE Mathematics (1MA1) — Geometry and Measures
What You Need to Know
Apply the sine rule
a
sin
A
=
b
sin
B
=
c
sin
C
\frac{a}{\sin A} = \frac{b}{\sin B} = \frac{c}{\sin C}
s
i
n
A
to find unknown lengths and angles.
Revision Notes
1
Sine and Cosine Rules
9 key terms
Practise with Past Papers
Key Terms & Definitions
Previous Subtopic
Exact Trigonometric Values
Next Subtopic
Area of a Triangle
a
=
s
i
n
B
b
=
s
i
n
C
c
Apply the cosine rule
a
2
=
b
2
+
c
2
−
2
b
c
cos
A
a^2 = b^2 + c^2 - 2bc \cos A
a
2
=
b
2
+
c
2
−
2
b
c
cos
A
to find unknown lengths and angles.
