本文目录一览:
- 1、数学中什么叫母线
- 2、什么是母线
- 3、母线 是什么
数学中什么叫母线
曲面图形可看成动线运动时的轨迹,形成曲面的动线称为母线。
曲面是一种几何图形,它是一条动线(直线或曲线)在空间连续运动的轨迹,产生曲面的那条线(直线或曲线)称为母线。控制母线运动的线或面,称为导线或导面,母线在曲面上任一位置,称为素线,曲线AB为导线,直线SB为母线,SB运动的各个位置为素线。
母线为直线时所形成的曲面中心称为直纹面;母线为曲线时所形成的曲面称为曲纹面。母线作规则运动时所形成的曲面称为规则曲面。控制母线运动的点、线、面称之为定点、导线和导面。
扩展资料
直圆锥母线的计算公式
用l表示圆锥母线,h表示圆锥的高,r表示圆锥底面的半径,
则由勾股定理得,
所以 ,
这就是圆锥母线的计算公式。
有关圆锥母线计算公式的推论
运用圆锥母线的计算公式可以得到,
什么是母线
平行于轴边的线叫做母线。
曲面是一种几何图形,它是一条动线(直线或曲线)在空间连续运动的轨迹,产生曲面的那条线(直线或曲线)称为母线。控制母线运动的线或面,称为导线或导面,母线在曲面上任一位置,称为素线。
曲线AB为导线,直线SB为母线,SB运动的各个位置为素线。母线为直线时所形成的曲面中心称为直纹面;母线为曲线时所形成的曲面称为曲纹面。母线作规则运动时所形成的曲面称为规则曲面。控制母线运动的点、线、面称之为定点、导线和导面。
扩展资料:
以矩形的一边所在直线为旋转轴,其余三边旋转形成的面所围成的旋转体叫做圆柱。旋转轴叫做圆柱的轴,垂直于轴的边旋转而成的圆面叫做圆柱的底面。
平行于轴的边旋转而成的曲面叫做圆柱的侧面,无论旋转到什么位置,平行于轴的边都叫做圆柱的母线。
参考资料来源:百度百科-母线(几何用语)
母线 是什么
母线指旋转体形成过程中,在任何位置时的不垂直于轴的曲线或直线。
比如,圆柱是由一个矩形绕一条边所在直线(也叫轴)旋转一周形成的封闭几何体。
在旋转过程中,不垂直于轴的那条边旋转形成的是侧面,旋转的过程中,旋转到任意位置的那条边都叫母线。
母线是什么
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