Let WXYZ be a trapezoid with bases XY and WZ. In this trapezoid, ZXW=105 degrees, XWZ=43 degrees, and XYZ=147 degrees. Find YXZ, in degrees.
Since XY || WZ ---> angle(ZWX) + angle(WXY) = 180o
---> angle(ZWX) + angle(WXZ) + angle(ZXY) = 180o
---> 43o + 105o + angle(ZXY) = 180o
Finish ...