Respostas

2014-06-05T18:02:59-03:00
b/4=c/2 ;  2b = 4c
 b+c=90;    c= 90 - b
2b = 4c   ; 2b = 4(90 - b) ;  2b = 360 - 4b ; 2b = 4b = 360;  6b = 360
b = 360/6   ; b = 60
c = 90 - b ; c = 90 - 60 ; c = 30