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d.innerHTML = d.innerHTML + '<a class=\"download_word download_word_lb\" href=\"javascript:;\" id=\"vipdown\" onclick=\"showpay(2)\"><div class=\"download_card\"><div class=\"card_nr card_nr_lb\"><h4 class=\"card_bt\">下学期 4.2 弧度制</h4><div class=\"download_card_msg\">们在平面几何中研究角的度量，当时是用度做单位来度量角，  的角是如何定义的？规定把周角的  作为1度的角．我们把用度做单位来度量角的制度叫做角度制，在数学和其他许多科学研究中还要经常用到另一种度量角的制度—弧度制，它是如何定义呢？（2）弧度制定义我们把等于半径长的圆弧所对的圆心角叫做1弧度的角，如图1，弧  的长等于半径  ，  所对的圆心角  就是1弧度的角，弧度制的单位符号是  ，读作弧度． 图1 的弧度数         的弧度数  提问：若弧是一个半圆，则其圆心角的弧度数是多少？若弧是一个整圆呢？。下面小编给大家分享下学期 4.2 弧度制，希望能帮助到大家。 下学期 4.2 弧度制文档下载网址链接：</div></div><div class=\"download_card_btn download_card_btn_lb\"><div class=\"content_box_tj\"><span>推荐度：</span><img src=\"/skin/zhann/images/icon_star.png\" alt=\"\">	<img src=\"/skin/zhann/images/icon_star.png\" alt=\"\">	<img src=\"/skin/zhann/images/icon_star.png\" alt=\"\">	<img src=\"/skin/zhann/images/icon_star.png\" alt=\"\"></div><div class=\"downlod_btn_right demo_tc downlod_btn_right_lb\"><em class=\"downlod_icon\"></em>点击下载文档<span>文档为doc格式</span></div> </div></div></a>';
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