2 years ago

Ill mark brainlist plss help

Mathematics

1 answer:

Hatshy [7]2 years ago

5 0

Answer:

$\frac{3×7}{5×7} \frac{21}{35}$

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Check the picture below.

$\bf \textit{Law of Cosines}\\ \quad \\
c^2 = {{ a}}^2+{{ b}}^2-(2{{ a}}{{ b}})cos(C)\implies 
c = \sqrt{{{ a}}^2+{{ b}}^2-(2{{ a}}{{ b}})cos(C)}
\\\\\\
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-------------------------------\\\\
\begin{cases}
d=10\\
e=18\\
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$\bf \implies cos^{-1}\left(0.893\overline{93}\right)=\measuredangle D\implies 26.63^o\approx \measuredangle D$

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