单选题
In parallelogram WXYZ shown above, WYis perpendicular to YZ and the measure of angle WZY is 72°. What is the measure of angle XYW?
【正确答案】
B
【答案解析】According to the figure, angle WZY is 72°. Note that angle WYZ is 90°, which means that angle ZWY must be 18° (180°-72°-90°=18°). Therefore, the angle in question must also be 18°.