求解，求平形四边形ABCD的面积！大家一起来帮帮看看这道题目怎么做
<p>求各位大神帮忙，求平形四边形ABCD的面积。<img src="http://new.0817ch.com/data/attachment//forum/201801/24/105515jmdgjpb4mk3gc47k.jpg" border="0" aid="attachimg_630075" width="null" alt=""/>哎老了老了，小孩题目一点都不会做啊......要锻炼脑力了，很怕以后老年痴呆。</p><p><br/></p><p style="text-align: center;"><img src="data/attachment/forum/201801/24/110051jjdozwt7jnsdvsoe.png" alt="_20171229151454.png" aid="attachimg_630088"/></p>
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