Question

In triunghiul dreptunghic ABC , m (A) =90 de grade , m (B) =30 de grade, AB=9 cm. Calculați BC si AC.


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Answer 1

$cos30\textdegree=\frac{AB}{BC} \\ \\ \frac{\sqrt3}{2}=\frac{9}{BC} \\ \\ BC=\frac{18}{\sqrt3}=6\sqrt3 \\ \\ AC=BCsin30\textdegree=3\sqrt3$