thanks 79 find the measure of angle 4 using the Law of Cosin

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79 find the measure of angle 4 using the Law of Cosines. Picure is not drawn to sc Preview degrees Given the triangle Give your answer accurate to at least one decimal place Points possible: 3 This is attempt 1 of 10. Submit

Solution

finding measure of angle A by applying law of cosines

16^2 = 19^2 + 15^2 - 2 (19) (15) cos A

cos A = 16^2 / [ 19^2 + 15^2 - 2 (19) (15) ]

A = 54.6 degrees