Curriculum
Pure Mathematics — Second Secondary
Unit 1: Real Functions and Curve Sketching
0/8
Unit 2: Exponents and Logarithms
0/12
Unit 3: Limits
0/6
Text lesson
The Sine Rule
The Sine Rule
Common mistakes
Common mistakes
Key points
Mixing up a side and its opposite angleside a must be paired with angle A, side b with angle B, and so on.
Forgetting the ambiguous casewith two sides and a non-included angle there may be two triangles, so both must be checked.
Using the sine rule for SASwhen two sides and the included angle are given, use the cosine rule instead.
Calculator in the wrong modemake sure the calculator is set to degrees when the angles are given in degrees.
The Sine Rule · 4 / 5