Q1. Given the equilateral triangle shown, and the length of its side as 125mm, use the cosine rule to satisfy yourself that the internal angle shown is indeed 60o





Q2. Given angle A = 21.30 and sides ’b’ and ‘c’ as shown, evaluate the length of side ‘a’ and the remaining angles B and C.


Q3. Given the information shown, calculate:


  • The area of triangle ABC
  • The length of side AB using the cosine rule.



Q4. Given the triangle ABC and the information shown, calculate:


  • The PERIMETER of triangle ABC, quote your answer to 3 significant figures.






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