For triangle Δ ABC

Cosine Law is

Cosine law.jpg

Here

  • A, B, C are vertices of Δ ABC
  • a is side opposite to A i.e. BC
  • b is side opposite to B i.e. AC
  • c is side opposite to C i.e. AB

 

Let’s look at its proof

 

Slide1.JPG

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Another way to remember cosine formula

Cosine formula can also be remembered as

Cosine law formula.jpg

  1. Chapter 3 Class 11 Trigonometric Functions
  2. Concept wise
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For triangle ABC Cosine Law is Here A, B, C are vertices of ABC a is side opposite to A i.e. BC b is side opposite to B i.e. AC c is side opposite to C i.e. AB Let s look at its proof Another way to remember cosine formula Cosine formula can also be remembered as

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 8 years. He provides courses for Maths and Science at Teachoo. You can check his NCERT Solutions from Class 6 to 12.