Respostas

2014-06-01T22:21:58-03:00
B/4 = c/2
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b= 4 × c/2
b = 2 c

b + c = 90
2 c + c = 90
c = 90/3 = 30
b/4 = 30/2
b = 15 × 4
b = 60