You can put this solution on YOUR website! The total of all angles for a 4-sided polygon is 180(4-2) = 360
360 - 70 - 56 = 234
234/2 = degrees. Divided 234 by 2 because angle X = angle Z. To see angle X = angle Z, you can draw a line connecting X to Z, then in isoscolese triangle XYZ, angle YXZ = angle YZX. Similarly for triangle WXZ (angle WXZ = angle WZX). Thus angle X = angle Z.