Overfladeareal - roteret om x - Formel-samling.dk

Følgende formel kan finde overfladearealet for et legme roteret om x-aksen, i afgrænsningen a til b

\(A = 2 \cdot \pi \cdot \int^a_b \, \left(f(x) \cdot \sqrt{1+ f ` (x)^{2}}\right \, dx\)

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