Answer:
What is the question
Step-by-step explanation:
38 degrees
180-142
12x+4y=40
-4 -4
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12x=36
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12 12
36÷12=3
4.2 cm
The law of cosines is applicable.
l² = k² +m² -2km·cos(L)
l² = 5.1² +1.2² -2·5.1·1.2·cos(35°) ≈ 17.4236
l ≈ √17.4236
l ≈ 4.2 . . . cm
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