小学数学求扇形面积例题 关于扇形面积的题目！！！！

\u5c0f\u5b66\u6570\u5b66\u6c42\u6247\u5f62\u9762\u79ef

\u4f60\u6307\u7684\u6247\u5f62\u662f\u54ea\u4e2a\u6247\u5f62\u5462\uff0cabc\u4e0d\u662f\u4e00\u4e2a\u6247\u5f62\u5427\u3002 \u9634\u5f71\u9762\u79ef\u5012\u662f\u53ef\u4ee5\u8868\u793a..
\u8fde\u63a5oboc\u8fc7o\u505aod\u5782\u76f4bc\u6839\u636e\u540c\u5f27\u6240\u5bf9\u7684\u5706\u5fc3\u89d2\u7b49\u4e8e\u4e8c\u500d\u7684\u5706\u5468\u89d2\u53ef\u4ee5\u77e5\u9053\u89d2bod=\u89d2cod\u7b49\u4e8e\u89d2A
\u56e0\u4e3a\u534a\u5f84\u4e3ar\uff0c\u9634\u5f71\u9762\u79ef\u53ef\u4ee5\u7528\u6247\u5f62obc\u51cf\u53bb\u4e09\u89d2\u5f62obc\u5f0f\u5b50\u662f

\u4e0d\u8fc7\u8fd9\u597d\u50cf\u4e0d\u662f\u5c0f\u5b66\u751f\u505a\u7684\u9898\u5427..\u6709\u95ee\u9898\u53ef\u4ee5\u63a5\u7740\u8ffd\u95ee\uff0c\u671b\u91c7\u7eb3

1\u3001\u957f\u65b9\u5f62\u7684\u5468\u957f=\uff08\u957f+\u5bbd\uff09\u00d72 C=(a+b)\u00d72
2\u3001\u6b63\u65b9\u5f62\u7684\u5468\u957f=\u8fb9\u957f\u00d74 C=4a
3\u3001\u957f\u65b9\u5f62\u7684\u9762\u79ef=\u957f\u00d7\u5bbd S=ab
4\u3001\u6b63\u65b9\u5f62\u7684\u9762\u79ef=\u8fb9\u957f\u00d7\u8fb9\u957f S=a.a= a
5\u3001\u4e09\u89d2\u5f62\u7684\u9762\u79ef=\u5e95\u00d7\u9ad8\u00f72 S=ah\u00f72
6\u3001\u5e73\u884c\u56db\u8fb9\u5f62\u7684\u9762\u79ef=\u5e95\u00d7\u9ad8 S=ah
7\u3001\u68af\u5f62\u7684\u9762\u79ef=\uff08\u4e0a\u5e95+\u4e0b\u5e95\uff09\u00d7\u9ad8\u00f72 S=\uff08a\uff0bb\uff09h\u00f72
8\u3001\u76f4\u5f84=\u534a\u5f84\u00d72 d=2r \u534a\u5f84=\u76f4\u5f84\u00f72 r= d\u00f72
9\u3001\u5706\u7684\u5468\u957f=\u5706\u5468\u7387\u00d7\u76f4\u5f84=\u5706\u5468\u7387\u00d7\u534a\u5f84\u00d72 c=\u03c0d =2\u03c0r
10\u3001\u5706\u7684\u9762\u79ef=\u5706\u5468\u7387\u00d7\u534a\u5f84\u00d7\u534a\u5f84 Ѕ=\u03c0r
11\u3001\u957f\u65b9\u4f53\u7684\u8868\u9762\u79ef=\uff08\u957f\u00d7\u5bbd+\u957f\u00d7\u9ad8\uff0b\u5bbd\u00d7\u9ad8\uff09\u00d72
12\u3001\u957f\u65b9\u4f53\u7684\u4f53\u79ef =\u957f\u00d7\u5bbd\u00d7\u9ad8 V =abh
13\u3001\u6b63\u65b9\u4f53\u7684\u8868\u9762\u79ef=\u68f1\u957f\u00d7\u68f1\u957f\u00d76 S =6a
14\u3001\u6b63\u65b9\u4f53\u7684\u4f53\u79ef=\u68f1\u957f\u00d7\u68f1\u957f\u00d7\u68f1\u957f V=a.a.a= a
15\u3001\u5706\u67f1\u7684\u4fa7\u9762\u79ef=\u5e95\u9762\u5706\u7684\u5468\u957f\u00d7\u9ad8 S=ch
16\u3001\u5706\u67f1\u7684\u8868\u9762\u79ef=\u4e0a\u4e0b\u5e95\u9762\u9762\u79ef+\u4fa7\u9762\u79ef
S=2\u03c0r +2\u03c0rh=2\u03c0(d\u00f72) +2\u03c0(d\u00f72)h=2\u03c0(C\u00f72\u00f7\u03c0) +Ch
17\u3001\u5706\u67f1\u7684\u4f53\u79ef=\u5e95\u9762\u79ef\u00d7\u9ad8 V=Sh
V=\u03c0r h=\u03c0(d\u00f72) h=\u03c0(C\u00f72\u00f7\u03c0) h
18\u3001\u5706\u9525\u7684\u4f53\u79ef=\u5e95\u9762\u79ef\u00d7\u9ad8\u00f73
V=Sh\u00f73=\u03c0r h\u00f73=\u03c0(d\u00f72) h\u00f73=\u03c0(C\u00f72\u00f7\u03c0) h\u00f73
19\u3001\u957f\u65b9\u4f53\uff08\u6b63\u65b9\u4f53\u3001\u5706\u67f1\u4f53\uff09\u7684\u4f53
1\u3001 \u6bcf\u4efd\u6570\u00d7\u4efd\u6570\uff1d\u603b\u6570 \u603b\u6570\u00f7\u6bcf\u4efd\u6570\uff1d\u4efd\u6570 \u603b\u6570\u00f7\u4efd\u6570\uff1d\u6bcf\u4efd\u6570
2\u3001 1\u500d\u6570\u00d7\u500d\u6570\uff1d\u51e0\u500d\u6570 \u51e0\u500d\u6570\u00f71\u500d\u6570\uff1d\u500d\u6570 \u51e0\u500d\u6570\u00f7\u500d\u6570\uff1d1\u500d\u6570
3\u3001 \u901f\u5ea6\u00d7\u65f6\u95f4\uff1d\u8def\u7a0b \u8def\u7a0b\u00f7\u901f\u5ea6\uff1d\u65f6\u95f4 \u8def\u7a0b\u00f7\u65f6\u95f4\uff1d\u901f\u5ea6
4\u3001 \u5355\u4ef7\u00d7\u6570\u91cf\uff1d\u603b\u4ef7 \u603b\u4ef7\u00f7\u5355\u4ef7\uff1d\u6570\u91cf \u603b\u4ef7\u00f7\u6570\u91cf\uff1d\u5355\u4ef7
5\u3001 \u5de5\u4f5c\u6548\u7387\u00d7\u5de5\u4f5c\u65f6\u95f4\uff1d\u5de5\u4f5c\u603b\u91cf \u5de5\u4f5c\u603b\u91cf\u00f7\u5de5\u4f5c\u6548\u7387\uff1d\u5de5\u4f5c\u65f6\u95f4 \u5de5\u4f5c\u603b\u91cf\u00f7\u5de5\u4f5c\u65f6\u95f4\uff1d\u5de5\u4f5c\u6548\u7387
6\u3001 \u52a0\u6570\uff0b\u52a0\u6570\uff1d\u548c \u548c\uff0d\u4e00\u4e2a\u52a0\u6570\uff1d\u53e6\u4e00\u4e2a\u52a0\u6570
7\u3001 \u88ab\u51cf\u6570\uff0d\u51cf\u6570\uff1d\u5dee \u88ab\u51cf\u6570\uff0d\u5dee\uff1d\u51cf\u6570 \u5dee\uff0b\u51cf\u6570\uff1d\u88ab\u51cf\u6570
8\u3001 \u56e0\u6570\u00d7\u56e0\u6570\uff1d\u79ef \u79ef\u00f7\u4e00\u4e2a\u56e0\u6570\uff1d\u53e6\u4e00\u4e2a\u56e0\u6570
9\u3001 \u88ab\u9664\u6570\u00f7\u9664\u6570\uff1d\u5546 \u88ab\u9664\u6570\u00f7\u5546\uff1d\u9664\u6570 \u5546\u00d7\u9664\u6570\uff1d\u88ab\u9664\u6570
\u5c0f\u5b66\u6570\u5b66\u56fe\u5f62\u8ba1\u7b97\u516c\u5f0f
1 \u3001\u6b63\u65b9\u5f62 C\u5468\u957f S\u9762\u79ef a\u8fb9\u957f \u5468\u957f\uff1d\u8fb9\u957f\u00d74 C=4a \u9762\u79ef=\u8fb9\u957f\u00d7\u8fb9\u957f S=a\u00d7a
2 \u3001\u6b63\u65b9\u4f53 V:\u4f53\u79ef a:\u68f1\u957f \u8868\u9762\u79ef=\u68f1\u957f\u00d7\u68f1\u957f\u00d76 S\u8868=a\u00d7a\u00d76 \u4f53\u79ef=\u68f1\u957f\u00d7\u68f1\u957f\u00d7\u68f1\u957f V=a\u00d7a\u00d7a
3 \u3001\u957f\u65b9\u5f62
C\u5468\u957f S\u9762\u79ef a\u8fb9\u957f
\u5468\u957f=(\u957f+\u5bbd)\u00d72
C=2(a+b)
\u9762\u79ef=\u957f\u00d7\u5bbd
S=ab
4 \u3001\u957f\u65b9\u4f53
V:\u4f53\u79ef s:\u9762\u79ef a:\u957f b: \u5bbd h:\u9ad8
(1)\u8868\u9762\u79ef(\u957f\u00d7\u5bbd+\u957f\u00d7\u9ad8+\u5bbd\u00d7\u9ad8)\u00d72
S=2(ab+ah+bh)
(2)\u4f53\u79ef=\u957f\u00d7\u5bbd\u00d7\u9ad8
V=abh
5 \u4e09\u89d2\u5f62
s\u9762\u79ef a\u5e95 h\u9ad8
\u9762\u79ef=\u5e95\u00d7\u9ad8\u00f72
s=ah\u00f72
\u4e09\u89d2\u5f62\u9ad8=\u9762\u79ef \u00d72\u00f7\u5e95
\u4e09\u89d2\u5f62\u5e95=\u9762\u79ef \u00d72\u00f7\u9ad8
6 \u5e73\u884c\u56db\u8fb9\u5f62
s\u9762\u79ef a\u5e95 h\u9ad8
\u9762\u79ef=\u5e95\u00d7\u9ad8
s=ah
7 \u68af\u5f62
s\u9762\u79ef a\u4e0a\u5e95 b\u4e0b\u5e95 h\u9ad8
\u9762\u79ef=(\u4e0a\u5e95+\u4e0b\u5e95)\u00d7\u9ad8\u00f72
s=(a+b)\u00d7 h\u00f72
8 \u5706\u5f62
S\u9762\u79ef C\u5468\u957f \u220f d=\u76f4\u5f84 r=\u534a\u5f84
(1)\u5468\u957f=\u76f4\u5f84\u00d7\u220f=2\u00d7\u220f\u00d7\u534a\u5f84
C=\u220fd=2\u220fr
(2)\u9762\u79ef=\u534a\u5f84\u00d7\u534a\u5f84\u00d7\u220f
9 \u5706\u67f1\u4f53
v:\u4f53\u79ef h:\u9ad8 s;\u5e95\u9762\u79ef r:\u5e95\u9762\u534a\u5f84 c:\u5e95\u9762\u5468\u957f
(1)\u4fa7\u9762\u79ef=\u5e95\u9762\u5468\u957f\u00d7\u9ad8
(2)\u8868\u9762\u79ef=\u4fa7\u9762\u79ef+\u5e95\u9762\u79ef\u00d72
(3)\u4f53\u79ef=\u5e95\u9762\u79ef\u00d7\u9ad8
\uff084\uff09\u4f53\u79ef\uff1d\u4fa7\u9762\u79ef\u00f72\u00d7\u534a\u5f84
10 \u5706\u9525\u4f53
v:\u4f53\u79ef h:\u9ad8 s;\u5e95\u9762\u79ef r:\u5e95\u9762\u534a\u5f84
\u4f53\u79ef=\u5e95\u9762\u79ef\u00d7\u9ad8\u00f73
\u603b\u6570\u00f7\u603b\u4efd\u6570\uff1d\u5e73\u5747\u6570
\u548c\u5dee\u95ee\u9898
(\u548c\uff0b\u5dee)\u00f72\uff1d\u5927\u6570
(\u548c\uff0d\u5dee)\u00f72\uff1d\u5c0f\u6570
\u548c\u500d\u95ee\u9898
\u548c\u00f7(\u500d\u6570\uff0d1)\uff1d\u5c0f\u6570
\u5c0f\u6570\u00d7\u500d\u6570\uff1d\u5927\u6570
(\u6216\u8005 \u548c\uff0d\u5c0f\u6570\uff1d\u5927\u6570)
\u5dee\u500d\u95ee\u9898
\u5dee\u00f7(\u500d\u6570\uff0d1)\uff1d\u5c0f\u6570
\u5c0f\u6570\u00d7\u500d\u6570\uff1d\u5927\u6570
(\u6216 \u5c0f\u6570\uff0b\u5dee\uff1d\u5927\u6570)
\u690d\u6811\u95ee\u9898
1 \u975e\u5c01\u95ed\u7ebf\u8def\u4e0a\u7684\u690d\u6811\u95ee\u9898\u4e3b\u8981\u53ef\u5206\u4e3a\u4ee5\u4e0b\u4e09\u79cd\u60c5\u5f62:
\u2474\u5982\u679c\u5728\u975e\u5c01\u95ed\u7ebf\u8def\u7684\u4e24\u7aef\u90fd\u8981\u690d\u6811,\u90a3\u4e48:
\u682a\u6570\uff1d\u6bb5\u6570\uff0b1\uff1d\u5168\u957f\u00f7\u682a\u8ddd\uff0d1
\u5168\u957f\uff1d\u682a\u8ddd\u00d7(\u682a\u6570\uff0d1)
\u682a\u8ddd\uff1d\u5168\u957f\u00f7(\u682a\u6570\uff0d1)
\u2475\u5982\u679c\u5728\u975e\u5c01\u95ed\u7ebf\u8def\u7684\u4e00\u7aef\u8981\u690d\u6811,\u53e6\u4e00\u7aef\u4e0d\u8981\u690d\u6811,\u90a3\u4e48:
\u682a\u6570\uff1d\u6bb5\u6570\uff1d\u5168\u957f\u00f7\u682a\u8ddd
\u5168\u957f\uff1d\u682a\u8ddd\u00d7\u682a\u6570
\u682a\u8ddd\uff1d\u5168\u957f\u00f7\u682a\u6570
\u2476\u5982\u679c\u5728\u975e\u5c01\u95ed\u7ebf\u8def\u7684\u4e24\u7aef\u90fd\u4e0d\u8981\u690d\u6811,\u90a3\u4e48:
\u682a\u6570\uff1d\u6bb5\u6570\uff0d1\uff1d\u5168\u957f\u00f7\u682a\u8ddd\uff0d1
\u5168\u957f\uff1d\u682a\u8ddd\u00d7(\u682a\u6570\uff0b1)
\u682a\u8ddd\uff1d\u5168\u957f\u00f7(\u682a\u6570\uff0b1)
2 \u5c01\u95ed\u7ebf\u8def\u4e0a\u7684\u690d\u6811\u95ee\u9898\u7684\u6570\u91cf\u5173\u7cfb\u5982\u4e0b
\u682a\u6570\uff1d\u6bb5\u6570\uff1d\u5168\u957f\u00f7\u682a\u8ddd
\u5168\u957f\uff1d\u682a\u8ddd\u00d7\u682a\u6570
\u682a\u8ddd\uff1d\u5168\u957f\u00f7\u682a\u6570
\u76c8\u4e8f\u95ee\u9898
(\u76c8\uff0b\u4e8f)\u00f7\u4e24\u6b21\u5206\u914d\u91cf\u4e4b\u5dee\uff1d\u53c2\u52a0\u5206\u914d\u7684\u4efd\u6570
(\u5927\u76c8\uff0d\u5c0f\u76c8)\u00f7\u4e24\u6b21\u5206\u914d\u91cf\u4e4b\u5dee\uff1d\u53c2\u52a0\u5206\u914d\u7684\u4efd\u6570
(\u5927\u4e8f\uff0d\u5c0f\u4e8f)\u00f7\u4e24\u6b21\u5206\u914d\u91cf\u4e4b\u5dee\uff1d\u53c2\u52a0\u5206\u914d\u7684\u4efd\u6570
\u76f8\u9047\u95ee\u9898
\u76f8\u9047\u8def\u7a0b\uff1d\u901f\u5ea6\u548c\u00d7\u76f8\u9047\u65f6\u95f4
\u76f8\u9047\u65f6\u95f4\uff1d\u76f8\u9047\u8def\u7a0b\u00f7\u901f\u5ea6\u548c
\u901f\u5ea6\u548c\uff1d\u76f8\u9047\u8def\u7a0b\u00f7\u76f8\u9047\u65f6\u95f4
\u8ffd\u53ca\u95ee\u9898
\u8ffd\u53ca\u8ddd\u79bb\uff1d\u901f\u5ea6\u5dee\u00d7\u8ffd\u53ca\u65f6\u95f4
\u8ffd\u53ca\u65f6\u95f4\uff1d\u8ffd\u53ca\u8ddd\u79bb\u00f7\u901f\u5ea6\u5dee
\u901f\u5ea6\u5dee\uff1d\u8ffd\u53ca\u8ddd\u79bb\u00f7\u8ffd\u53ca\u65f6\u95f4
\u6d41\u6c34\u95ee\u9898
\u987a\u6d41\u901f\u5ea6\uff1d\u9759\u6c34\u901f\u5ea6\uff0b\u6c34\u6d41\u901f\u5ea6
\u9006\u6d41\u901f\u5ea6\uff1d\u9759\u6c34\u901f\u5ea6\uff0d\u6c34\u6d41\u901f\u5ea6
\u9759\u6c34\u901f\u5ea6\uff1d(\u987a\u6d41\u901f\u5ea6\uff0b\u9006\u6d41\u901f\u5ea6)\u00f72
\u6c34\u6d41\u901f\u5ea6\uff1d(\u987a\u6d41\u901f\u5ea6\uff0d\u9006\u6d41\u901f\u5ea6)\u00f72
\u6d53\u5ea6\u95ee\u9898
\u6eb6\u8d28\u7684\u91cd\u91cf\uff0b\u6eb6\u5242\u7684\u91cd\u91cf\uff1d\u6eb6\u6db2\u7684\u91cd\u91cf
\u6eb6\u8d28\u7684\u91cd\u91cf\u00f7\u6eb6\u6db2\u7684\u91cd\u91cf\u00d7100%\uff1d\u6d53\u5ea6
\u6eb6\u6db2\u7684\u91cd\u91cf\u00d7\u6d53\u5ea6\uff1d\u6eb6\u8d28\u7684\u91cd\u91cf
\u6eb6\u8d28\u7684\u91cd\u91cf\u00f7\u6d53\u5ea6\uff1d\u6eb6\u6db2\u7684\u91cd\u91cf
\u5229\u6da6\u4e0e\u6298\u6263\u95ee\u9898
\u5229\u6da6\uff1d\u552e\u51fa\u4ef7\uff0d\u6210\u672c
\u5229\u6da6\u7387\uff1d\u5229\u6da6\u00f7\u6210\u672c\u00d7100%\uff1d(\u552e\u51fa\u4ef7\u00f7\u6210\u672c\uff0d1)\u00d7100%
\u6da8\u8dcc\u91d1\u989d\uff1d\u672c\u91d1\u00d7\u6da8\u8dcc\u767e\u5206\u6bd4
\u6298\u6263\uff1d\u5b9e\u9645\u552e\u4ef7\u00f7\u539f\u552e\u4ef7\u00d7100%(\u6298\u6263\uff1c1)
\u5229\u606f\uff1d\u672c\u91d1\u00d7\u5229\u7387\u00d7\u65f6\u95f4
\u7a0e\u540e\u5229\u606f\uff1d\u672c\u91d1\u00d7\u5229\u7387\u00d7\u65f6\u95f4\u00d7(1\uff0d20%)
\u65f6\u95f4\u5355\u4f4d\u6362\u7b97
1\u4e16\u7eaa=100\u5e74 1\u5e74=12\u6708
\u5927\u6708(31\u5929)\u6709:1\3\5\7\8\10\12\u6708
\u5c0f\u6708(30\u5929)\u7684\u6709:4\6\9\11\u6708
\u5e73\u5e742\u670828\u5929, \u95f0\u5e742\u670829\u5929
\u5e73\u5e74\u5168\u5e74365\u5929, \u95f0\u5e74\u5168\u5e74366\u5929
1\u65e5=24\u5c0f\u65f6 1\u65f6=60\u5206
1\u5206=60\u79d2 1\u65f6=3600\u79d2\u79ef=\u5e95\u9762\u79ef\u00d7\u9ad8 V=Sh

有一把扇子。圆心角的度数为240.半径为10厘米。求扇形面积。

扇形面积求法：圆的面积×圆心角度数/360°

希望对你有帮助。

扇形圆心角度数乘上3.14乘扇形所在圆的半径的平方，除以360。

r²×3.14÷360×扇形角度

根据不同的题目采取不同的解答方法，看图形的条件来列算式。

弄

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