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Mécanique des fluides (problème QCM TAT)


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Bonsoir j'ai un problème avec l'item 1 du QCM cidessous et plus précisément concernant la correction que le TAT propose

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image.thumb.png.7f24065d39fbdc9071f4fff7f7ced08e.png

la premiere partie de l'équation est juste (pi x r1² x v1 = pi x r2² x v2) mais je comprend pas pourquoi quand on remplace par les valeur numérique le r2² devient 3 au lieu de 3² est donc 9 ?

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