作业帮英语翻译There are three kinds of lines :the straight line ,the b
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英语翻译
There are three kinds of lines :the straight line ,the broken line ,and the curved line .
A curved line or,curve is a line no part of which is straight.
A broken line is composed of joined ,straight line segments ,as ABCDE of Fig.2-2-3.
3.Parts of a circle.A circle is a closed curve lying in one plane ,all points of which are equidistant from a fixed point called the center (Fig.2-2-4).
The symbol for a circle is ⊙.
In Fig.2-2-4 ,O is the center of ⊙ABC ,or simply of ⊙O.
A line segment drawn from the center of the circle to a point on the circle is a radius ( plural ,radii ) of the circle.OA ,OB ,and OC are radii of ⊙O .
A diameter of a circle is a line segment through the center of the circle with endpoints on the circle.
A diameter is equal to two radii.A chord of the circle in Fig.2-2-4.
From this definition it should be apparent that a diameter is a chord.
Any part of a circle is an arc,such as arc AE,which is denoted by ⌒AB .
Points A and E divide the circle into minor arc AE and major arc ABE.
A diameter divides a circle into two arcs termed semicircles,such as ⌒AB and ⌒BCA .
The circumference is the length of a circle.
There are three kinds of lines :the straight line ,the broken line ,and the curved line .
A curved line or,curve is a line no part of which is straight.
A broken line is composed of joined ,straight line segments ,as ABCDE of Fig.2-2-3.
3.Parts of a circle.A circle is a closed curve lying in one plane ,all points of which are equidistant from a fixed point called the center (Fig.2-2-4).
The symbol for a circle is ⊙.
In Fig.2-2-4 ,O is the center of ⊙ABC ,or simply of ⊙O.
A line segment drawn from the center of the circle to a point on the circle is a radius ( plural ,radii ) of the circle.OA ,OB ,and OC are radii of ⊙O .
A diameter of a circle is a line segment through the center of the circle with endpoints on the circle.
A diameter is equal to two radii.A chord of the circle in Fig.2-2-4.
From this definition it should be apparent that a diameter is a chord.
Any part of a circle is an arc,such as arc AE,which is denoted by ⌒AB .
Points A and E divide the circle into minor arc AE and major arc ABE.
A diameter divides a circle into two arcs termed semicircles,such as ⌒AB and ⌒BCA .
The circumference is the length of a circle.
线可以区分为三种：直线,破折线,和弯曲线.
一条弯曲的线,或称曲线,是一条没有任何部分笔直的线.
一条破折线是有许多相连的直线线段所组成的,如图2-2-3中的 ABCDE.
3.园形的各个部分.一个圆形是一个在同一平面上的封闭曲线,线上所有的点和一个叫做圆心的点都是等距的.
一个圆形的标记是 ⊙.
在图.2-2-4中 ,O 是 ⊙ABC 的圆心,也可称为 ⊙O.
从圆心画出到圆周上一个点所组成的线段是圆形的半径（英语中复数形式拼做 radii）OA ,OB ,和 OC 都是 ⊙O 的半径.
直径是两个端点位于圆上,并通过圆心的一个线段.
直径相当于两个半径.如图2-2-4显示的是一个园的弦.
从这定义很明显地可以知道,直径也是一个弦.
圆形的任何一个部分都被称为弧,如图上的AE弧,标示的方式是 ⌒AB .
A 和 E 这两点把整个圆分割为一个小弧AE,和一个大弧ABE.
一条直径把园分作两个弧,称作半圆,如图上标示的⌒AB and ⌒BCA
圆周（或周长）是圆的长度.
一条弯曲的线,或称曲线,是一条没有任何部分笔直的线.
一条破折线是有许多相连的直线线段所组成的,如图2-2-3中的 ABCDE.
3.园形的各个部分.一个圆形是一个在同一平面上的封闭曲线,线上所有的点和一个叫做圆心的点都是等距的.
一个圆形的标记是 ⊙.
在图.2-2-4中 ,O 是 ⊙ABC 的圆心,也可称为 ⊙O.
从圆心画出到圆周上一个点所组成的线段是圆形的半径（英语中复数形式拼做 radii）OA ,OB ,和 OC 都是 ⊙O 的半径.
直径是两个端点位于圆上,并通过圆心的一个线段.
直径相当于两个半径.如图2-2-4显示的是一个园的弦.
从这定义很明显地可以知道,直径也是一个弦.
圆形的任何一个部分都被称为弧,如图上的AE弧,标示的方式是 ⌒AB .
A 和 E 这两点把整个圆分割为一个小弧AE,和一个大弧ABE.
一条直径把园分作两个弧,称作半圆,如图上标示的⌒AB and ⌒BCA
圆周（或周长）是圆的长度.
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