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  • 01-08-2019
  • Mathematics
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HURRY I NEED HELP!!! Solve triangle JKL round to the answer to the nearest tenth

HURRY I NEED HELP Solve triangle JKL round to the answer to the nearest tenth class=

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Аноним Аноним
  • 01-08-2019

Answer:

It's Option A.

Step-by-step explanation:

Using the Cosine Rule:

cos < K =  (3.9^2 - 1.9^2 - 2.8^2) / (-2 *1.9*2.8)

=  3.76 / -10.64

= - 0.3534.

m < K = 110.7 degrees.

Using the Sine Rule:

3.9 / sin 110.7 = 2.8 / sin <J

sin J =   2.8 sin 110.7/ 3.9 = 0.6716

m < J = 42.2 degrees

So m < L = 180 - (110.7 + 42.2)

= 180 - 152.9

= 27.1 degrees

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