圆锥表面积公式

{"name":"\u5706\u9525\u8868\u9762\u79ef\u516c\u5f0f","type":"\u7eaa\u5f55\u7247","area":"\u6cf0\u56fd","year":"1983","lang":"\u97e9\u8bed","play":"4k","type1":"\u7eaa\u5f55\u7247"}