In ΔABC if A = 60° , b = 3 and c = 8 then find a.
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Given : In ΔABC if A = 60° , b = 3 and c = 8
To Find : a
Solution:
Using cosine rule of triangle
a² = b² + c² - 2bc cosA
=> a ² = 3² + 8² - 2(3)(8)cos60°
=> a² = 9 + 64 - 48 (1/2)
=> a² = 9 + 64 - 24
=> a² = 49
=> a = 7
Hence Value of a is 7
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