2014年小学六年级数学《圆的认识》练习题

<div style="text-align: center;"><strong><font color="#ff0000">2014年小学六年级数学圆的认识(一)</font></strong></div><br><div style="text-align: center;">姓名:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;评分:</div><br><span><strong>一、我会填。(每空1分,共24分)</strong></span><br><br><span>1、圆中心的一点叫(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;),通常用字母(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)表示,它决定了圆的(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)。</span><br><br><span>2、通过(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;),并且两端都在圆上的(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;),叫作圆的直径,用字母(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)表示。直径是圆内两端都在圆上的所有线段中(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)的一条。</span><br><br><span>3、从(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)到圆上(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)一点的线段叫作圆的半径,用字母(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)表示,它决定了圆的(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)。</span><br><br><span>4、时钟的分针转动一周形成的图形是(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;),分针的长度是这个图形的(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;),它一昼夜走(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)圈。</span><br><br><span>5、正方形的边长是10㎝,在它之中画一个最大的圆,圆的半径是(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)㎝。</span><br><br><span>6、在一个长8㎝,宽6㎝的长方形里剪一个圆,它的最大直径是(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)㎝。</span><br><br><span>7、在同圆或等圆内,(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)的长度是(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)长度的2倍,我们字母表示(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)。</span><br><br><span>8、(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)决定圆的大小,(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)决定圆的位置。</span><br><br><span>9、一个圆内有(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)条半径,它们的长度(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)。</span><br><br><span>10、圆中最长的线段是(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)。</span><br><br><span><strong>二、我会辩一辩。(每题2分,共10分)</strong></span><br><br><span>1、圆的直径都相等。(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)</span><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><br><br><span>2、同一个圆上所有的点到圆心的距离都相等。(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)</span><br><br><span>3、直径一定比半径长。(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)</span><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><br><br><span>4、半径是射线,直径是直线。(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)</span><br><br><span>5、画圆时,圆规两脚间的距离就是圆的直径。(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)</span><br><br><span><strong>三、我会选。(每题2分,共10分)</strong></span><br><br><span>1、一个圆有(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)条直径。</span><br><br><span>A、1&nbsp;</span><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span>&nbsp;B、2&nbsp;</span><span>&nbsp;&nbsp;&nbsp;&nbsp;</span><span>&nbsp;C、无数</span><br><br><span>2、在一个边长是5㎝的正方形内,画一个最大的圆。它的半径是(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)。&nbsp;&nbsp;&nbsp;</span><br><br><span>A、5㎝&nbsp;</span><span>&nbsp;&nbsp;&nbsp;&nbsp;</span><span>&nbsp;B、10㎝&nbsp;</span><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span>&nbsp;C、任意长&nbsp;</span><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span>&nbsp;D、2.5㎝</span><br><br><span>3、</span><span>圆的直径是半径的(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)。&nbsp;&nbsp;</span><span>&nbsp;&nbsp;&nbsp;</span><span>&nbsp;</span><br><br><span>A、2倍&nbsp;</span><span>&nbsp;&nbsp;&nbsp;&nbsp;</span><span>&nbsp;B、</span><span>&nbsp;</span><span>&nbsp;&nbsp;&nbsp;&nbsp;</span><span>&nbsp;C、</span><span>1.2</span><span>倍</span><br><br><span>4、</span><span>直径和半径都是(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)。&nbsp;&nbsp;</span><span>&nbsp;&nbsp;&nbsp;</span><span>&nbsp;</span><br><br><span>A、射线&nbsp;</span><span>&nbsp;&nbsp;&nbsp;&nbsp;</span><span>&nbsp;B、直线&nbsp;</span><span>&nbsp;&nbsp;&nbsp;&nbsp;</span><span>&nbsp;C、线段</span><br><br><span>5、</span><span>画圆时,圆规两脚分开4㎝,所画的圆的直径是(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)㎝。</span><br><br><span>A、2.5&nbsp;</span><span>&nbsp;&nbsp;&nbsp;&nbsp;</span><span>&nbsp;B、4&nbsp;</span><span>&nbsp;&nbsp;&nbsp;&nbsp;</span><span>&nbsp;C、8</span><br><br><span><strong>四、我会算。(21分)</strong></span><br><br><span>1、看一看,填一填表。(6分)</span><div><br> <table width="100%" border="1"><tbody><tr><td><br>半径(r)<br></td><td><br>2cm<br></td><td><br>&nbsp;<br></td><td><br>&nbsp;<br></td><td><br>7dm<br></td><td><br>&nbsp;<br></td><td><br>1.5m<br></td></tr><tr><td><br>直径(d)<br></td><td><br>&nbsp;<br></td><td><br>1.2cm<br></td><td><br>9m<br></td><td><br>&nbsp;<br></td><td><br>4.8cm<br></td><td><br>&nbsp;<br></td></tr></tbody></table> <br><span>2、</span><span>算一算。(15分)</span><br><br><span>100-43=&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;56</span><span>÷</span><span>14=&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;18</span><span>×</span><span>5=&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;630</span><span>÷</span><span>70=</span><br><br><span>550</span><span>÷</span><span>5=&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;69</span><span>÷</span><span>3=&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;14</span><span>×</span><span>30=&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><br><br><span>800-600</span><span>÷</span><span>20&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;18</span><span>×</span><span>(537-488)</span><br><br><span>25</span><span>×</span><span>37</span><span>×</span><span>4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;720</span><span>÷</span><span>16</span><span>÷</span><span>5&nbsp;&nbsp;&nbsp;</span><br><br><span><strong>五、我会画。(每题5分,共20分)</strong></span><br><br><span>1、半径是2㎝的圆。&nbsp;</span></div><div><span><br></span></div><div><span>2、</span><span>直径是3㎝的圆。</span><br><br>3、以点O为圆心画一个任意大小的圆,并画出它的一条半径和直径。</div><div><br></div><div>4、以点A为圆心,画出两个大小不同的圆。<br><br><strong><span>六、解决问题。(15分)</span><span>&nbsp;</span></strong><br><br><span>1、在一张长5㎝,宽3㎝的长方形白纸上画一个最大的圆,它的直径是多少㎝?</span><br><br><span>2、在一个长20㎝,宽15㎝的长方形纸板上最多能剪出几个直径是5㎝的圆?</span><br><br><img src="//www.szxuexiao.com/uploadimages/2014/0924/201492418216.jpg?m=0.8780341607052833"><br><br><span>3、自行车运行不平稳时,修车师傅常常要调整车轮上车条的长度。请你说一说,修车师傅这么做的依据是什么?</span><br><br><br><div style="text-align: center;"><span style="font-weight: bold;"><font color="#38761d">圆的认识(二)</font></span></div><br><div style="text-align: center;">姓名:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;评分:</div><br><strong><span>一、认真阅读,仔细分析,填上答案。</span><span>(每空1分,共20分)</span></strong><br><br><span>1、在同圆或等圆中,所有的直径长度都(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;),所有的半径长度都(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)</span><span>。</span><br><br><span>2、(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)确定圆的位置,(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)决定圆的大小。</span><br><br><span>3、圆中最长的线段是(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)。</span><br><br><span>4、</span><span>在等圆或同圆内,(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)的长度是(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)长度的2倍,用字母公式表示为(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)。&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><br><br><span>5、将圆对折,两侧正好完全重合,说明圆是(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)图形,直径所在的(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)就是圆的对称轴,圆有(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)条对称轴。</span><br><br><span>6、用圆规画圆时,圆规两脚之间的距离是4㎝,那么这个圆的半径是(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)㎝,直径是(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)㎝。</span><br><br><span>7、长方形有(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)条对称轴,正方形有(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)条对称轴,等边三角形有(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)条对称轴,圆有(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)条对称轴,等腰梯形有(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)条对称轴,等腰三角形有(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)条对称轴。</span><br><br><span>8、大圆的半径和小圆的直径相等,大圆的半径是小圆半径的(&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)倍。</span><br><br><span><strong>二、辨别对错。(每题2分,共10分)</strong></span><br><br><span>1、因为圆有无数条对称轴,所以半圆也有无数条对称轴。(&nbsp;&nbsp;&nbsp;)</span><br><br><span>2、所以圆的半径都相等。(&nbsp;&nbsp;&nbsp;)</span><br><br><span>3、长方形、正方形、等边三角形、平行四边形、等腰梯形和圆都是轴对称图形。(&nbsp;&nbsp;&nbsp;)</span><br><br><span>4、圆的对称轴一定过圆心。(&nbsp;&nbsp;&nbsp;)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><br><br><span>5、圆的直径是半径的2倍。(&nbsp;&nbsp;&nbsp;)</span><br><br><span><strong>三、选一选。(每题2分,共10分)</strong></span><br><br><span>1、一个圆最少对折(&nbsp;&nbsp;&nbsp;)次,可以找到圆心。</span><br><br><span>A、1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B、2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;C、3</span><br><br><span>2、只有一条对称轴的图形是(&nbsp;&nbsp;&nbsp;)。</span><br><br><span>A、圆&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B、长方形&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;C、等腰三角形</span><br><br><span>3、两端都在圆上的线段(&nbsp;&nbsp;&nbsp;)</span><br><br><span>A、一定不是直径&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B、一定是直径&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span> </span><span>C、可能是直径也可能不是直径</span><br><br><span>4、在一个边长是15cm的正方形内,画一个最大的圆。它的半径是(&nbsp;&nbsp;&nbsp;)。</span><br><br><span>A、15cm&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B、30cm&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;C、任意长&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;D、7.5cm</span><br><br><span>5、画圆时,圆规两脚分开4cm,所画的圆的直径是(&nbsp;&nbsp;&nbsp;)cm。</span><br><br><span>A、2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B、4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;C、8</span><br><br><strong><span>四、</span><span>算一算。(20分)</span></strong><br><br><span>1、填表。(10分)</span></div><div><br> <table width="100%" border="1"><tbody><tr><td><br>直径/cm<br></td><td><br>&nbsp;<br></td><td><br>0.8<br></td><td><br>&nbsp;<br></td><td><br>1.5<br></td><td><br>&nbsp;<br></td></tr><tr><td><br>半径/cm<br></td><td><br>7.6<br></td><td><br>&nbsp;<br></td><td><br>6.28<br></td><td><br>&nbsp;<br></td><td><br>2.4<br></td></tr></tbody></table> <br><span>2、计算。(10分)</span><br><br><span>3.14</span><span>×</span><span>8=&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.5</span><span>÷</span><span>2=&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;7</span><span>÷</span><span>=&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.6</span><span>÷</span><span>2=</span><br><br><span>4.5</span><span>×</span><span>2=&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0.75</span><span>÷</span><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.2+5.8=&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4.4</span><span>×</span><span>2.3=</span><br><br><strong><span>五、</span><span>看图,解决问题(20分)</span></strong><br><br><img src="//www.szxuexiao.com/uploadimages/2014/0924/2014924182611.jpg?m=0.023451964603736997"><br><br><strong><span>六、</span><span>尝试解决问题。(10分)</span></strong><br><br><span>1、用一块长6m,宽1.2m的铁皮,剪成半径是0.15m的圆片,最多可以剪多少个?</span><br><br><span>2、如图:圆的直径是多少cm?半径是多少cm?</span><br><br><img src="//www.szxuexiao.com/uploadimages/2014/0924/2014924182751.jpg?m=0.49108513235114515"><br></div><div><br></div>