Question

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Calculati masura alfa a unghiului, utilizind tabelul trigonometric
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Answer 1

$a)sin \alpha = \frac{ \sqrt{300} }{20}= \frac{10 \sqrt{3} }{20} = \frac{ \sqrt{3} }{2} \\ \alpha =60° \\ b)cos \alpha = \frac{2 \sqrt{5} }{ \sqrt{80} } = \frac{2 \sqrt{5} }{4 \sqrt{5} } = \frac{1}{2 \\} \\ \alpha =60°$