Respuesta :

the base of the pennant is 12 feet shorter than the height......A = (1/2) * b * h 

80 = (1/2) * (h - 12) * h 
160 = h^2 - 12h 

12/2 = 6 
6^2 = 36 

h^2 - 12h + 36 = 160 + 36 
(h - 6)^2 = 196 
h - 6 = 14 
h = 20 

b = 8 

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