3 years ago

Question 28 plz because i don’t know how to do it with explanation plz

Mathematics

1 answer:

Nat2105 [25]3 years ago

7 0

Answer:

do we find the value of unknown angle ?

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olga2289 [7]

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50.2

Step-by-step explanation:

$ut = \sqrt{ {6}^{2} + {5}^{2} } \\ \sqrt{36 + 25} \\ \sqrt{61 } \\ using \: cosine \: rule \\ cos \: u = \frac{ {5}^{2} + 61 - 36 }{2 \times 5 \times \sqrt{61} } \\ \\ = \frac{25 + 61 - 36}{78} \\ \\ = \frac{50}{78 } \\ \cos \: u = 0.64 \\ m∠U. = 50.2$