2) tg 60° = cat. opt = 1,73 = 20 = 1,73 adj = 20 => cat. adj = 20 =11,50
cat . adj cat. adj 1,73
tg 30° = cat. opt = 0,57 = x => x= 6,55
cat. adj 11,50
3) cosseno 45° = cat.adj = [tex] \sqrt{2} /2=x/10 => 2x=10* \sqrt{2} => x=5* \sqrt{2} [/tex]
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cosseno 60°= cat.opt = 1/2= x/10 => x=10/2 => x=5 d=[tex]5+5 \sqrt{2} [/tex]
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4) tg 45°=cat.opt => 1 = x/30 lado em comum =30
cat. adj
sen 30°= cat. opt = 1/2=30/y => y=60
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cosseno 30° = cat. adj = [tex] \sqrt{3} /2= 60/x => x \sqrt{3} =120 =>x=120/ \sqrt{3} => racionalizando e simplificando se encontra x=40* \sqrt{3} [/tex]
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