The length of a in the diagram attached is : 22.18
Meaning of cosine rule
Cosine rule is used in trigonometry. it is used to find a missing side when given two sides and an angle, or to find an angle given three sides.
The cosine rule is easy to comprehend and assimilate.
Applying the Cosine formula written as : [tex]a^{2}[/tex] = [tex]b^{2}[/tex] + [tex]c^{2}[/tex] - 2bc cosA
the length of a is 22.18
In conclusion, the length of a using the cosine rule is : 22.18
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