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x la altura
4x + 30 = base
Perimetro = 2x +2(4x+30)
180 = 2x + 8x + 60
180 = 10x + 60
180-60 = 10x
120 = 10x
120/10 = x
12 = x
Si la altura es x y esta mide 12
entonces:
4x + 30 = base
4(12) + 30 =
48 + 30 = 78
Ahora teniendo los valores de la base y la altura sacamos el área
b x h = 78 *12
= 936 pies