3 years ago

Can someone please answer. There is one question. There's a picture. Thank you!

1 answer:

5 0

By Cosine Rule:

CosT = (s² + r² - t²) /(2sr)

<span>CosT = (10² + 11² - 7²) /(2*11*10)
</span>
<span>CosT = 172 /220 </span>≈ 0.7818

T = Cos⁻¹(0.7818)

T ≈ 38.57°

T ≈ 38.6°

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