如图所示,城关幼儿园为加强安全管理,决定将园内的滑滑板的倾斜角由45°降为30°,已知原滑滑板AB的长为4米,点D、B、C在同一水平地面上.
(1)改善后滑滑板会加长多少米?
(2)若滑滑板的正前方能有3米长的空地就能保证安全,原滑滑板的前方有6米长的空地,像这样改造是否可行?请说明理由.
(参考数据:
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164147191183552/SYS201310221641471911835018_ST/0.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164147191183552/SYS201310221641471911835018_ST/1.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164147191183552/SYS201310221641471911835018_ST/2.png)
,以上结果均保留到小数点后两位)
考点分析:
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