一个多边形的一个外角为α,且该多边形的内角和与α的和等于840°,则这个多边形的边数为_____ ,α=_____ 度.
更新时间:2018-08-28 05:05:11
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【推荐1】平行四边形ABCD绕点A逆时针旋转30°,得到平行四边形AB′C′D′(点B′与点B是对应点,点C′与点C是对应点,点D′与点D是对应点),点B′恰好落在BC边上,B′C′与CD交于点E,则∠DEB′=_____ .
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【推荐2】如图,直线
是多边形
的对称轴,其中
,
,那么
的度数为__________ .
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【推荐1】小燕偶然发现爸爸手机有软件可用来测量方位,于是她来到小区一处广场上.如图,小燕从P点向西直走10米后,向左转,转动的角度为α=30度,再走10米,再左转30度,如此重复,最终小燕又回到点P,则小燕一共走了___ 米.
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【推荐2】如图,线段
,
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两两相交于点
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____ .
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