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In ΔJKL, l = 1.3 inches, j = 4.8 inches and ∠K=77°. Find ∠L, to the nearest 10th of an degree.

 May 3, 2021
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In ΔJKL, l = 1.3 inches, j = 4.8 inches and ∠K=77°. Find ∠L, to the nearest 10th of a degree.

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Using the Law of cosines calculate the third side of a triangle JKL:

k2 = l2 + j2 - 2lj*cos(K)           

 

And again, use the Law of cosines to find the measure of angle L:

l2 = j2 + k2 - 2jk * cos(L)

 May 3, 2021
edited by Guest  May 3, 2021
edited by Guest  May 3, 2021

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