[tex]cos \: \alpha = \frac{2 \sqrt{2} }{4} [/tex]
[tex]cos \: \alpha = \frac{1}{2} \sqrt{2} [/tex]
[tex] \alpha = 45°[/tex]
C
[tex]sin \: 30° = \frac{ AC}{20} [/tex]
[tex] \frac{1}{2} = \frac{ AC}{20} [/tex]
[tex] AC = \frac{20}{2} [/tex]
[tex] AC = 10 \: cm[/tex]
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13
[tex]cos \: \alpha = \frac{2 \sqrt{2} }{4} [/tex]
[tex]cos \: \alpha = \frac{1}{2} \sqrt{2} [/tex]
[tex] \alpha = 45°[/tex]
C
14
[tex]sin \: 30° = \frac{ AC}{20} [/tex]
[tex] \frac{1}{2} = \frac{ AC}{20} [/tex]
[tex] AC = \frac{20}{2} [/tex]
[tex] AC = 10 \: cm[/tex]