Respostas

2014-08-24T18:01:12-03:00
90-70=20
180-20=160
resposta: 160°
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2014-08-24T18:09:37-03:00
Suplemente=180
complemento=90
180-(90-x)=70
180-90+x=70
x=90+70
x=160
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