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lana66690 [7]
3 years ago
7

PLEASE HELP!!!!!!

Mathematics
2 answers:
tia_tia [17]3 years ago
7 0

Answer:

20.7 correct rounding for odyssey

Step-by-step explanation:

jek_recluse [69]3 years ago
5 0
\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)}\\\\
-----------------------------\\\\

\begin{cases}
a=12\\
b=10\\
D=90+50
\end{cases}\implies d = \sqrt{{{ 12}}^2+{{ 10}}^2-2(12)(10)cos(140^o)}
\\\\\\
d\approx \sqrt{427.851}\implies d\approx 20.684551
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