Trigonometry (Continued)


   
 
Half-Angle Formulae
Theorem:
 
If ABC is a triangle with sides a = BC, b = CA, c = AB, then prove that
 
 
 
 
where 2s = a + b + c.
 
 
Proof:
 
2s = a + b + c
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
     
   
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