Respostas

2014-03-19T20:11:32-03:00
B/4 = c/2
2b = 4c (Multiplica cruzado)
b = 90 - c
2 * (90 - c) = 4c 
180 - 2c = 4c
180 = 6c
c = 180/6
c = 30

b+c = 90
b + 30 = 90
b = 60

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