When polygons are similar their corresponding angles are congruent and their corresponding sides are proportional. The order of the proportionality statement tells us which angles and sides are corresponding. To solve, set up a proportion. AD/WZ = DC/ZY 12/WZ = 6/36 Cross multiply. 6(WZ) = 12*36 6(WZ) = 432 Divide both sides by 6 WZ = 72