How can the triangles be proven similar by the SAS similarity theorem? Show that the ratios XY/VU and YZ/VW are equivalent, and ∠U ≅ ∠X.

Show that the ratios UV/XY and WV/ZY are equivalent, and ∠V ≅ ∠Y.

Show that the ratios UW/ZX and XY/WV are equivalent, and ∠W ≅ ∠X.

Show that the ratios XZ/WU and ZY/WV are equivalent, and ∠U ≅ ∠Z.