Sine and Cosine

  • 0 votes

A power boat race is run around a triangular course marked by three buoys A, B and C. AB = 1200 m,

AC = 800 m and BC = 1000 m.

a) Calculate the size of angle ABC.

During the race a boat breaks down after it has travelled a distance 200 m from B, along the leg BC, and has to be towed back directly to the start of the race at A.

b) Calculate the distance the boat is towed.        

Posted Mon 20th February, 2012 @ 14:15 by Aiysha Rasul

2 Answers

  • 0 votes

From I gather, you'll have to use the sine and cosine rules to answer this question, with the angle found in part (a) needed for part (b).

sine rule: a/sinA = b/sinB = c/sinC

cosine rule: c^2 = a^2 + b^2 - (2ab x cosC)

Answered Sat 19th May, 2012 @ 17:08 by sammiecaine
  • 0 votes


Answered Sat 26th May, 2012 @ 16:43 by sopjie