题目

. —How about going out for a picnic on Sunday morning?        —Hmm．___．The weather is very good these days．        A．Yes, why not   B．Well, no way    C．Oh, never mind       D．Sure, no matter 答案：A9．在△ABC中，AB=$\sqrt{5}$，AC=2，BC=3．（1）求该三角形外接圆的面积；（2）将△ABC绕AC所在直线旋转一周，求所得几何体的表面积．