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JEE Mathematics · Easy

Trigonometry: Cosine Rule MCQ

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Cosine RuleEasyQuestion 200034

Question

In triangle ABC, a² = b² + c² − 2bc cos A. This is known as:
  1. A
    Sine rule
  2. B
    Cosine rule
    Correct
  3. C
    Tangent rule
  4. D
    Projection formula

Correct answer

Cosine rule

Explanation

The cosine rule expresses each side in terms of the other two and the included angle.

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