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A = D * d / 2
A = Area
D = Diagonal mayor
d = Diagonal menor
Reemplazamos
D * d / 2 = A
28 * d / 2 = 140
28 * d = 140 * 2
28 * d = 280
d = 280 / 28
d = 10cm ------------------->Este es el valor de la diagonal menor
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