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初中数学 | 两个角谁大?别靠"感觉"!——角的比较与运算

初中数学 | 两个角谁大?别靠"感觉"!——角的比较与运算

教材定位:人教版七年级上册 · 第四章 几何图形初步 · 4.3.2 角的比较与运算

一、角的大小,看"开口"

角的边是射线,可以无限延长,所以角的大小和边的长短没有关系——把边画得再长,角还是那个角。

角的大小只取决于开口:开口越大,角越大。就像扇子,张得越开,扇面越大。

二、比较角的大小:两招

第一招 · 度量法:

用量角器分别量出两个角的度数,度数大的角大。最直接、最客观。

第二招 · 叠合法:

把两个角的顶点重合,一条边重合,看另一条边的位置:

  • 另一条边落在对方内部,这个角
  • 落在对方外部,这个角
  • 完全重合,两个角相等

度量法用度数说话,叠合法用眼睛定位,两条路都能比出大小。

三、角的和与差:大角拆小角

角也能像线段一样做加减:

  • OC 在 ∠AOB 内部:∠AOB = ∠AOC + ∠BOC
  • 反过来:∠AOC = ∠AOB − ∠BOC∠BOC = ∠AOB − ∠AOC
  • OC 在 ∠AOB 外部:∠AOC = ∠AOB + ∠BOC

一句话理解:角的和差,就是大角拆小角;加起来是总数,减下去是分量。

四、角平分线:把角"对半分"

角平分线:一条射线把一个角分成两个相等的角,这条射线就是这个角的平分线。

  • OC 平分 ∠AOB ⇔ ∠AOC = ∠BOC = ∠AOB 的一半
  • 反向用:∠AOB = 2∠AOC = 2∠BOC。

角平分线把角分成两个相等的角,每个小角都等于大角的一半。

五、三个必踩的坑,一个都不能踩

坑一:比大小靠"眼睛"

两条射线画得长短不一,就说角不一样大 ✗

正确:角的大小看开口,不看边的长短;拿不准就量一量。

坑二:角平分线"随手画中间"

凭感觉从顶点往中间画一条线,就说是平分线 ✗

正确:必须把角分成两个相等的角——量一量两个小角相等才算数。

坑三:和差算错方向

∠AOB = 80°,∠BOC = 30°,OC 在外部,∠AOC 却写成 50° ✗

正确:外部相加,∠AOC = 80° + 30° = 110°✓;内部才相减。

六、例题实战:一步一步来

例1:∠AOB = 100°,OC 平分 ∠AOB,求 ∠AOC

角平分线定义:∠AOC = ∠AOB ÷ 2。

算:100° ÷ 2 = 50°。

解:∠AOC = 50°

例2:∠AOB = 80°,OC 在内部,∠AOC = 30°,求 ∠BOC

内部相减:∠BOC = ∠AOB − ∠AOC。

算:80° − 30° = 50°。

解:∠BOC = 50°

例3:∠AOB = 70°,∠BOC = 30°,OC 在 ∠AOB 外部,求 ∠AOC

外部相加:∠AOC = ∠AOB + ∠BOC。

算:70° + 30° = 100°。

解:∠AOC = 100°

例4:∠AOC = ∠BOC = 45°,OC 是否平分 ∠AOB?∠AOB 是多少?

看定义:两个小角相等,都是 45°,所以 OC 平分 ∠AOB。

算:∠AOB = 45° + 45° = 90°。

解:OC 平分 ∠AOB,∠AOB = 90°

七、易错陷阱总盘点

陷阱
错误示范
正确做法
看边长短比大小
"边长的角大"
看开口,度量法为准
平分线靠感觉
从中间随手一画
两小角相等才算平分
外部当内部减
∠AOC = 70°−30°
外部相加:70°+30°
漏小角
和差只算大角
∠AOB=∠AOC+∠BOC 全写
平分线忘了×2
∠AOB 只算一半
2 倍关系双向用

八、练一练

① ∠AOB = 90°,OC 平分 ∠AOB,∠AOC = ___°② ∠AOB = 120°,OC 在内部,∠AOC = 45°,∠BOC = ___°③ 一个角 40°,另一个 50°,哪个大?为什么?④ ∠AOB = 110°,∠BOC = 20°(OC 在外部),∠AOC = ___°⑤ 判断:角的两边越长,角越大。(对 / 错)

答案放评论区,做完来对。角会比大小、会做加减了,接下来是两个角的"配对"关系——下篇:余角和补角,看看 90° 和 180° 里藏着的"另一半"。


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  1. CONNECT:[ UseTime:0.000918s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001412s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002509s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000903s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001422s ]
  6. SELECT * FROM `set` [ RunTime:0.000620s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001451s ]
  8. SELECT * FROM `article` WHERE `id` = 969995 LIMIT 1 [ RunTime:0.005944s ]
  9. UPDATE `article` SET `lasttime` = 1787750111 WHERE `id` = 969995 [ RunTime:0.002194s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000685s ]
  11. SELECT * FROM `article` WHERE `id` < 969995 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001459s ]
  12. SELECT * FROM `article` WHERE `id` > 969995 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001414s ]
  13. SELECT * FROM `article` WHERE `id` < 969995 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004549s ]
  14. SELECT * FROM `article` WHERE `id` < 969995 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004868s ]
  15. SELECT * FROM `article` WHERE `id` < 969995 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005090s ]
0.139786s