2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/173343We show that under the hypotheses of Strominger, Yau and Zaslow's paper, a mirror partner of a K3 surface $X$ with a fibration in special Lagrangian tori can be obtained by rotating the complex structure of $X$ within its hyperkähler family of complex structures. The same hypotheses force the B-field to vanish.7 pages, Ams-Latex v. 1.2, no figures. References updated, a sentence changed. To appear in Lett. Math. PhysMathematical PhysicsHigh Energy Physics - TheoryAlgebraic Geometrytext