Answer and Explanation
Your Answer is
Correct Answer is J
Explanation
Substitute the values of the three sides into the cosine theorem formula given in the question to find the degree of the angle (note that c is substituted with 14)
58. The sides of an acute triangle measure 14cm, 18 cm, and 20 cm, respectively. Which of the following equations, when solved for 
, gives the measure of the smallest angle of the triangle ?
(Note: For any triangle with sides of length a, b, c that are opposite angles A, B, C, respectively. 
and 
)