Sine Rule

The sine rule relates the sides of any triangle to the sines of their opposite angles: $\frac{a}{\sin A}=\frac{b}{\sin B}=\frac{c}{\sin C}$. It is used when we know two angles and one side, or two sides and a non-included angle, to find the missing parts.

You meet Sine Rule in the Solution of Triangles chapter of SPM Additional Mathematics. Knowing the term precisely matters in the exam: questions often hinge on reading a keyword correctly, and because SPM marking is analytic, using the right definition in your working helps secure method marks.

Our teachers make sure a student can not only recite what Sine Rule means but use it fluently in a full solution.

Because the SPM Add Math paper is bilingual (BM/EN), it helps to know this term in each language: Sine Rule (EN) · Petua Sinus (BM) · 正弦定理 (中文)

Other key terms from the Solution of Triangles chapter you may want to check:

• Cosine Rule
• Ambiguous Case
• Area of a Triangle
• Heron's Formula
• Included Angle