15-07-2016
Mathematics

contestada

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

Can someone please answer There is one question Theres a picture Thank you class=

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olemakpadu olemakpadu

17-07-2016

By Cosine Rule:

CosT = (s² + r² - t²) /(2sr)

CosT = (10² + 11² - 7²) /(2*11*10)

CosT = 172 /220 ≈ 0.7818

T = Cos⁻¹(0.7818)

T ≈ 38.57°

T ≈ 38.6°

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