4. These are the steps to solve the angle using the Law of Cosines: a²=b²+ c²-2bc cos A 2bc cos A = b ² + c²-a² cos A = b²+c²-a² 2bc Similarly, to solve ZB, the formula to use is A. cos B = b²+c²-a² 2bc B. cos B = a²+c²-b² c²+b²-a² 2cb C. cos B = a²+b²-c² D. cos B = 2ac 2ab 5. The sides of an oblique triangle measure 5 cm each. What is the measure of all the angles of the triangle? A. 30° B. 45° C. 60° D. 90°

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