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a = 4b/3
2*(4b/3) + 2b = 86
8b/3 +6b/3 = 86
14b/3 = 86
b = 86*3/14 = 258/14 = 129/7 = 18.43
a = 4*(18.43) / 3 = 73.71/3 = 24.57
Respuesta:
18.43 cm