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词汇 angle bisector
分类 英语词汇 英语翻译词典
释义

angle bisector

英汉-汉英词典
角的平分线
词组 | 习惯用语
您要查找的是不是:
    angle bisection 角平分
    angle bisector theorem 角平分线定理
    external angle bisector 外分角
angle bisector 分角线;角平分线
中文百科

平分线

用直尺和圆规作出角平分线

平分线是一条能将一条线段二等分的线。

角平分线是将两条线相交所夹的角二等分的线。

性质

角平分线是一条特殊的射线,它具有以下重要性质:

角平分线上的任意一点,到角两边的距离相等。

即如图所示:

OM平分{\angle}AOB,POM上一点,PE{\perp}OAE,PF{\perp}OBF,

PE=PF.

该性质的证明

利用三角形全等,可以很容易推得此结论。

下面作一下简单推导。

{\because\quad}OM平分{\angle}AOB,

{\therefore\quad\angle}POE={\angle}POF.

{\because\quad}PE{\perp}OA,\;PF{\perp}OB,

{\therefore\quad\angle}OEP={\angle}OFP=90^{\circ}.

{\triangle}OEP{\triangle}OFP,

\begin{cases}
{\angle}OEP={\angle}OFP, \\
{\angle}POE={\angle}POF, \\
OP=OP,
\end{cases}

{\therefore\quad\triangle}OEP{\;\cong\triangle}OFP(\mbox{AAS}).

{\therefore\quad}PE=PF.

证毕。

英语百科

Bisection 平分线

Line DE bisects line AB at D, line EF is a perpendicular bisector of segment AD at C, and line EF is the interior bisector of right angle AED
Perpendicular Bisector
Bisection of an angle using a compass and straightedge

In geometry, bisection is the division of something into two equal or congruent parts, usually by a line, which is then called a bisector. The most often considered types of bisectors are the segment bisector (a line that passes through the midpoint of a given segment) and the angle bisector (a line that passes through the apex of an angle, that divides it into two equal angles).

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