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弧度是圆的直径吗

来源:baiyundou.net   日期:2024-08-22

经常有人会说为什么别人的串都那么好?看起来好高级?而我的却像地摊货。





那是因为他们会搭

会利用各种文玩配珠

把串搭配得好看显贵

你也想让你的串瞬间升级吗?

那先来了解一下文玩配珠吧

看完你也可以成为文玩老司机

从此配串不求人

一张图就让你看得明明白白▼



是不是挺震撼的

没想到配珠还有这么多吧

基础的珠型一般是五种

01

圆珠

圆珠是配串中最常见的款式

一般会选用高品质的圆珠

作为顶珠或者腰珠







或直接做成手串





或是加个饰扣做成吊坠

搭上链子美到极致





02

桶珠

桶珠整体呈圆柱型

一般也分为两种



一种叫老型桶珠,

肚子上微有点弧度,

直径比对孔大,

珠型饱满圆润,线条流畅

佩戴后给人一种柔和端庄的感觉。





另一种外形更接近圆柱形

边缘更加平直,更加利落

更有时尚感





用来做锁骨链或毛衣链是绝绝子

男女都适合

男性佩戴有硬汉气质

女性佩戴显干练也显优雅





03

鼓珠

鼓珠,形状就像一个牛皮鼓

肚子是鼓出来的

整体看比较古朴





鼓珠也可以用来做锁骨链

或是给其它文玩当配珠







04

墩子

厚而扁,底面平

像一个石墩子

它相比鼓珠更扁平



可做吊坠、DIY锁骨链

或者搭配金刚等都是绝美的





05

苹果珠

因为孔道处像苹果窝而得名

比圆珠略短

一般用来做吊坠或锁骨链

佩戴苹果珠更显年轻

俏皮又可爱又不失文雅



其它什么无相珠呀、金刚珠呀

柏香籽珠、拉丝珠

南瓜珠、转运珠、陨石珠

钻石珠、唐八棱等等

都是在这些基础珠型的基础上

或雕刻或切割或打磨而成



在这些珠子或配饰里

可能有几样新手不太容易区分

像平安扣和公主扣

平安扣是同心圆制

孔在中间

外圈的圆象征辽阔天地

内圈也是圆的

象征着我们内的平宁安远





而公主扣的孔在上方

孔型像漏斗又像鱼眼

也叫鱼眼平安





另一组是转运珠和瓜棱珠

转运珠的纹路是弯曲、

旋转的感觉



而瓜棱珠的纹路是相对垂直

像南瓜的瓜棱,也叫南瓜珠





还有一组是钻切珠和无相珠

钻切珠切割面多,折射面多

看起来像钻石一样闪



无相珠呢

不规则切割而成的

切割面比钻石要少

不过看起来设计感也是十足的





文玩无贵贱,人心有高低。其实不管它是哪种,只要你觉得好看,能配上你手里的串,那就OK了。

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冷锦饶2874圆周角是九十度所对的一定是直径么 -
官苏超18232217930 ______ 是的,圆周角所对的弧的度数为180度,而只有半圆的弧度数为180度,而弧对的圆心角等于弧度数为180度,这样的角必为平角,也就是直径.

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官苏超18232217930 ______[答案] 这里的弧度数是弧度. 弧长就是弧的长度,弧度就是弧所对应的圆心角的弧度. 例如这里,当l=2πr=周长的时候 l/r=2π=360°

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官苏超18232217930 ______[答案] 一个圆弧度为2π,而一个圆周长为2πR,一个圆的角度为360,对应的1rad=(180/π),若一个扇形的弧度为A,则扇形弧长为A*R/2π,还有弧度在三角函数中有重要作用,你现在不理解没关系,等到实际用用就理解了

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官苏超18232217930 ______ 圆是360度,1/360看作1度,那么,半周就是180度,一周就是360度. 另一个表示方法是把圆看作2π,半圆是π.那么1度=π/180. 如果知道弧长,知道半径,弧度=弧长/2πR 取一条直线交弧线于AB两点,然后过AB的垂直平分线;同样 再到一条不同的直线交弧线于CD两点,作CD的垂直平分线,两条垂直平分线的交点就是圆心了.有了圆心,就知道半径了,然后就什么都知道了.

冷锦饶2874关于度和弧度的定义,急用!1度的定义是1/360圆周角,1弧度的定义是弧长等于圆半径的弧所对的圆心角,为什么1弧度不能像1度一样定义 -
官苏超18232217930 ______[答案] (一)度°,将一个圆周等分为360份,每一段弧所对的圆周角的大小就是1º.(二)弧度.在一个圆周上,弧长等于半径的弧所对的圆心角就是1弧度的圆心角.

冷锦饶2874已知一圆弧长等于其所在圆的内接正方形的周长,则其圆心角的弧度数的绝对值为___. -
官苏超18232217930 ______[答案] 设圆的直径为2r,则圆内接正方形的边长为 2r, ∵圆的圆弧长度等于其所在圆的内接正方形的周长, ∴圆弧的长度为4 2r, ∴圆心角弧度为 42r r=4 2. 故答案为:4 2.

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官苏超18232217930 ______[答案] 应该是以圆的直径为一条边的圆内接三角形吧.证明方法很多,比如利用那条边(也就是直径)的中线(其实就是圆半径)长度的关系,得到一个角是90度 ,再比如,利用所在边对应的圆的弧度,我们知道整个圆的弧度是2π,半圆也就是π,两直角边...

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