Question

How do I solve using law of sines or law of Cosines ?

Answer 1

if you want to solve this problem using law of sin. Then use a/sinA = b/sinB = c/sinC.

if you want to solve this problem using law of cos. Then use a² = b² + c² - 2bc cosA, b² = a² + c² - 2ac cosB, c² = a² + b² - 2ac cosC