当前位置:首页>文档>四年级下册数学同步练习-7单元1课时-三角形的特征-苏教版解析_小学1-6年级全部试卷_数学_四年级_3-9-4、小学四年级数学下册_3-9-4-2、练习题、作业、试题、试卷_苏教版_课时练

四年级下册数学同步练习-7单元1课时-三角形的特征-苏教版解析_小学1-6年级全部试卷_数学_四年级_3-9-4、小学四年级数学下册_3-9-4-2、练习题、作业、试题、试卷_苏教版_课时练

  • 2026-02-21 12:12:22 2026-02-20 01:37:00

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四年级下册数学同步练习-7单元1课时-三角形的特征-苏教版解析_小学1-6年级全部试卷_数学_四年级_3-9-4、小学四年级数学下册_3-9-4-2、练习题、作业、试题、试卷_苏教版_课时练
四年级下册数学同步练习-7单元1课时-三角形的特征-苏教版解析_小学1-6年级全部试卷_数学_四年级_3-9-4、小学四年级数学下册_3-9-4-2、练习题、作业、试题、试卷_苏教版_课时练
四年级下册数学同步练习-7单元1课时-三角形的特征-苏教版解析_小学1-6年级全部试卷_数学_四年级_3-9-4、小学四年级数学下册_3-9-4-2、练习题、作业、试题、试卷_苏教版_课时练

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http://t.cn/Ri466E4 苏教版小学数学四年级下册 《三角形的特征》同步练习及参考答案 二、选择 1、空调机的固定架做成一个三角形是运用了三角形的( ) A.有三条边的特征 B.容易变形的特征 C.稳定不变的特征 【考点】:三角形的特性. 【解析】:根据三角形的特性:稳定性;据此进行解答即可. 【答案】:解:空调机的固定架做成一个三角形是运用了三角形的稳定性; 故选:C. 【总结】:此题考查了三角形的稳定性在生活中的实际运用. 2、自行车的三角架运用了三角形的( ). A.有三条边的特征 B.稳定性 C.易变形 【考点】:三角形的特性. 【解析】:根据三角形的特性:具有稳定性进行解答即可. 【答案】:解:因为三角形具有稳定性,自行车的三角架是利用三角形不易变形(稳定 性)的特性; 教育 1http://t.cn/Ri466E4 故选:B. 【总结】:此题考查了三角形的特性,注意三角形的稳定性在实际生活中的应用. 3、一个三角形有( )条高. A.1 B.3 C.无数 【考点】三角形的特性. 【解析】依据三角形的高的定义,即从三角形的顶点向对边作垂线,顶点和垂足之间的线 段就是三角形的高,三角形有三个顶点,三条边,所以三角形有三条高. 【答案】解:从三角形的顶点向对边作垂线,顶点和垂足之间的线段就是三角形的高,三 角形有三个顶点,三条边,所以三角形有三条高. 故选:B. 【总结】此题主要考查三角形的高的条数,所有的三角形都有3条高. 三、填空 1、三角形的定义是 :____________________________ 【考点】:三角形的定义. 【解析】:利用三角形的概念:由不在同一条直线上的三条线段首尾顺次相接所组成的图 形叫做三角形得出即可. 【答案】:解:三角形的定义是:由不在同一条直线上的三条线段首尾顺次相接所组成的 图形。 【总结】:此题主要考查了三角形的定义,正确把握定义是解题关键. 2、三角形有______条边,_______个角, ________个顶点. 【考点】:三角形的特性. 【解析】:根据三角形的意义和特性可知:三角形有3条边,3个角,3个顶点;解答即可. 【答案】:解:由分析知:三角形有3条边,3个角,3个顶点; 故答案为:3,3,3. 【总结】:此题考查的是对三角形含义和特性的理解,应注意基础知识的积累. 3、图中有 ( )个三角形. 【考点】组合图形的计数. 教育 2http://t.cn/Ri466E4 【解析】观察图形可知,先数出图中的子三角形的个数是 4个,再利用计算公式可得一共 有4+3+2+1=10个,据此即可解答问题. 【答案】解:根据题干分析可得:4+3+2+1=10(个) 故答案为:10. 【总结】此题考查了三角形的计数问题,要注意计算公式的灵活应用. 【解析】:根据图可知,要作三角形的高,可先找到三角形的底与底对应的顶点,然后再 过顶点向对边作垂线即可得到答案, 画法如下:使直角三角尺的一条直角边与三角形的底平行或重合,沿着底边左右移动直角 三角尺使三角形的顶点与直角三角尺的另一条直角边重合,沿着这条直角边画线,这条过 三角形的顶点和底边的线段就是三角形的高. 【答案】:解:作图如下: 【答案】:解答此题的依据是过直线外一点作已知直线的垂线的方法. 教育 3
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  1. CONNECT:[ UseTime:0.000908s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001302s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.012287s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000738s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001348s ]
  6. SELECT * FROM `set` [ RunTime:0.000635s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.001533s ]
  8. SELECT * FROM `wendang` WHERE `id` = 306295 LIMIT 1 [ RunTime:0.001042s ]
  9. UPDATE `wendang` SET `liulancishu` = 4 WHERE `id` = 306295 [ RunTime:0.017906s ]
  10. UPDATE `wendang` SET `lasttime` = 1772453097 WHERE `id` = 306295 [ RunTime:0.001218s ]
  11. SELECT * FROM `wendang` WHERE `id` < 306295 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001293s ]
  12. SELECT * FROM `wendang` WHERE `id` > 306295 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001097s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 306295 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002122s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 306295 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002247s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 306295 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001972s ]
0.138253s