Curriculum
General Mathematics — Second Secondary
Unit 1: Real Functions and Curve Sketching
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Unit 2: Exponents, Logarithms and Applications
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Unit 3: Limits
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Text lesson
The Sine Rule
The Sine Rule
Lesson summary
Lesson summary
- In any triangle, a / sin A = b / sin B = c / sin C = 2R.
- Use the sine rule when two angles and a side are known, or two sides and a non-included angle are known.
- The ambiguous case may give two triangles, so check the sum of the angles for each value.
- The three angles of a triangle add up to 180°, and each angle must be positive.
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