Respostas

  • Usuário do Brainly
2014-08-24T13:47:38-03:00
S = ( B + b ) . h / 2

B = 2h
b=6

28 = (2h+6).h/2
2h²+6h-56 = 0
h²-3h-28 = 0

DELTA = (-3)² - 4.1.(-28)
DELTA = 9 + 112
DELTA = 121

h = 3 + 11 / 2
h= 14/2
h=7 cm

B = 2h
B= 14 cm


1 3 1