bonjour
aire initiale = 8² = 64 cm²
nouveau côté = 8 * 1.2 = 9.6
nouvelle aire = 9.6 ² = 92.16
92.16 - 64 = 28.16
28.16 / 64 = 0.44
44 %
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bonjour
aire initiale = 8² = 64 cm²
nouveau côté = 8 * 1.2 = 9.6
nouvelle aire = 9.6 ² = 92.16
92.16 - 64 = 28.16
28.16 / 64 = 0.44
44 %