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以图中的线段m的长度为底，线段n的长度为底边上的高，作等腰三角形ABC．
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已知底边a和底边上的高h在用尺规作图方法作这个等腰△CDE使DE=aCB.=h时需用到的作法有①在M
作图求作一个等腰三角形使它的底边长为已知线段a底边上的高为已知线段h．要求用圆规直尺和铅笔作图并写
用尺规作图已知底边和底边上的高求作等腰三角形有下列作法①作线段BC＝a②作线段BC的垂直平分线m交B
线段垂直平分线上的点到线段两个端点的距离相等
角平分线上的点到这个角两边的距离相等
等角对等边
等腰三角形的对称性
如图MN⊥AB垂足为M.点MN交CD于N过M.点作MG⊥CD垂足为G.EF过点N.点且EF∥AB交M
如图已知线段ah.1作等腰△ABC使底边BC=aBC边上的高为h.要求用尺规作图写出作法保留作图痕迹
以图中的线段m的长度为直角边线段n的长度为斜边作直角三角形ABC．
如图N49在梯形ABCD中AD∥BCAD＝3DC＝5BC＝10梯形的高为4.动点M.从B.点出发沿
下列语句中正确的是
等腰三角形底边上的中线就是底边上的垂直平分线
等腰三角形的对称轴是底边上的高
一条线段可看作是以它的垂直平分线为对称轴的轴对称图形
等腰三角形的对称轴就是顶角平分线
若线段AB的长度为6cm线段BC的长度为4cmABC三点在同一直线上且M为AB的中点N为BC的中点
已知C.为线段AB的中点D.是线段AC的中点1画出相应的图形并求出图中线段的条数2若图中所有线段的长
M.是长度为12cm的线段AB的中点C点将线段MB分成MC∶CB=1∶2则线段AC的长度为
2 cm
8 cm
6 cm
4 cm
等腰三角形的腰长为10底长为12则其底边上的高为
13
8
25
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如图4等腰三角形ABC的底边长为16底边上的高AD长为6则腰AB的长度为_____.
定义:PQ分别是两条线段a和b上任意一点线段PQ长度的最小值叫做线段与线段的距离.已知O00A40B
已知线段ab用直尺和圆规作等腰△ABC使得底边AB=aAB边上的中线长为b.只要求保留作图痕迹不写作
已知线段ab求作以a为底边以b为底边上的高的等腰△ABC．
设a＞0b＞0称为ab的调和平均数.如图154所示C.为线段AB上的点且AC＝aCB＝bO.为A
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