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A = 20 m²
A = (½)ab
(½)b(b+6) = 20
b² + 6b = 40
b² + 6b - 40 = 0
b = 4 o b = -10
→ b = 4 por ser la positiva
La base es de 4 metros
a = b + 6
a = 4 + 6
a = 10
La altura es de 10 metros