Respostas

2014-03-22T15:49:07-03:00
b  =  c
4      2
b + c = 90

2b = 4c
b = 90 - c

2 (90 - c) = 4c
180 - 2c = 4c
- 2c - 4c = - 180
- 6c = - 180
c = - 180 ÷ (- 6)
c = 30

Valor de b:
b = 90 - c
b = 90 - 30
b = 60

Resposta:
b = 60 
c = 30
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