Categories
Mathematics

Sine or Cosine Rule

cosine rule eg5

Workings

No   |    Log

6.7      | 0.8261

Sin x6.6   |    T.8613

|  0.6874

5.386   |    0.7313

  Sin 64.67   |    T.9567

A = 64.67 or (180 – 64.67)

64.67 or 115.33

But B is acute  A cannot be acute

A = 115.3

C = 180 – (115.3 + 46.6)

= 180 – 161.9

= 18.10

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