配套习题- 弧长和扇形面积 -【青果学院】

挑战习题

1/5单选题

难度：

1.已知一个扇形的半径为12，圆心角为150°，则此扇形的弧长是（　　）

A	5π
B	6π
C	8π
D	10π

提示1：: 55u05o6l5Yip55So5byn6ZW/5YWs5byP5rGC5Ye65Y2z5Y+v77yO

正确答案：RA==

6Kej77ya5q2k5omH5b2i55qE5byn6ZW/5piv77yaPGltZyB3aWR0aD00OSBoZWlnaHQ9NDIgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC8xMC81OC9yQkFDRkZWaW5EX2pUZEt4QUFBQl93a0VjRUk2OTkucG5nIj49MTDPgO+8jjxicj7mlYXpgInvvJpE77yO

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2/5单选题

难度：

2.一个扇形的半径为8cm，弧长为

πcm，则扇形的圆心角为（　　）

A	60°
B	120°
C	150°
D	180°

提示1：: 5qC55o2u5byn6ZW/5YWs5byP5YiX5pa556iL5Y+v5b6X

正确答案：Qg==

6Kej77ya6K6+5omH5b2i5ZyG5b+D6KeS5Li6bsKw77yM5qC55o2u5byn6ZW/5YWs5byP5Y+v5b6X77yaPGltZyB3aWR0aD0yNyBoZWlnaHQ9NDIgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC9CMC83Mi9yQkFDRTFWaW5FYWp4dzBZQUFBQnN0QlRlT3c4MTEucG5nIj49PGltZyB3aWR0aD0xMyBoZWlnaHQ9NDIgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC83Qi8wMi9yQkFDSjFWaW5FYWhybGhQQUFBQlhjb3l5Y0E5NDAucG5nIj7PgO+8jDxicj7op6PlvpfvvJpuPTEyMMKw77yMPGJyPuaVhemAie+8mkLvvI4=

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3/5单选题

难度：

3.如图，已知▱ABCD的对角线BD=4cm，将▱ABCD绕其对称中心O旋转90°，则点D所转过的路径长为（　　）青果学院

A	4πcm
B	3πcm
C	2πcm
D	πcm

提示1：: 5qC55o2u5bmz6KGM5Zub6L655b2i55qE5oCn6LSo5b6X5YiwT0Q9T0I9PGltZyB3aWR0aD03IGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwL0IwLzcyL3JCQUNFMVZpbkRtUzAzcUVBQUFCSkdWcmJETTYyOC5wbmciPkJEPTLvvIznhLblkI7moLnmja7lvKfplb/lhazlvI/orqHnrpfljbPlj6/vvI4=

正确答案：RA==

6Kej77ya4oi15Zub6L655b2iQUJDROS4uuW5s+ihjOWbm+i+ueW9ou+8jDxicj7iiLRPRD1PQj08aW1nIHdpZHRoPTcgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvQjAvNzIvckJBQ0UxVmluRG1TMDNxRUFBQUJKR1ZyYkRNNjI4LnBuZyI+QkQ9Mu+8jDxicj7iiLTngrlE5omA6L2s6L+H55qE6Lev5b6E6ZW/PTxpbWcgd2lkdGg9MzMgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvN0EvRDUvckJBQ0psVmluRG1pcnlzakFBQUIwZWlvSmJ3NTQ2LnBuZyI+Pc+A77yIY23vvInvvI48YnI+5pWF6YCJRO+8jg==

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4/5单选题

难度：

4.如图，Rt△ABC中，∠C=90°，∠A=30°，AB=4，将△ABC绕点B按顺时针方向转动一个角到△A′BC′的位置，使点A、B、C′在同一条直线上，则图中阴影部分的面积是（　　）青果学院

A	4π+4
B	4π
C	2π+4
D	2π

提示1：: 5YWI5qC55o2uUnTilrNBQkPkuK3vvIziiKBDPTkwwrDvvIziiKBBPTMwwrDvvIxBQj005rGC5Ye6QkPlj4pBQ+eahOmVvw==

提示2：: 5YaN5qC55o2u6aKY5oSP5b6X5Ye6UzxzdWI+6Zi05b2xPC9zdWI+PUFC5omr6L+H55qE5omH5b2i6Z2i56evLUJD5omr6L+H55qE5omH5b2i6Z2i56ev

提示3：: 5qC55o2u5omH5b2i6Z2i56ev5YWs5byP5rGC5Ye65Y2z5Y+v77yO

正确答案：Qg==

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5/5单选题

难度：

5.钟面上的分针的长为l0厘米，从8点到8点15分，分针的外端点经过的路径的长是（　　）

A	10π厘米
B	π厘米
C	5π厘米
D	π厘米

提示1：: 5YWI6K6h566X5Ye65ZyG5b+D6KeS55qE5bqm5pWw77yM5YaN5qC55o2u5byn6ZW/5YWs5byP6L+b6KGM6K6h566X5Y2z5Y+v77yO

正确答案：Qw==

6Kej77ya4oi16ZKf6Z2i5LiK5YiG6ZKI57uP6L+HMTXliIbpkp/vvIw8YnI+4oi05ZyG5b+D6KeS55qE5bqm5pWw5Li6OTDluqbvvIw8YnI+4oi05YiG6ZKI55qE5aSW56uv54K557uP6L+H55qE6Lev5b6EbD08aW1nIHdpZHRoPTIwIGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzdCLzAyL3JCQUNKMVZpbklPaTl2MmJBQUFCcTE1T29hVTIxNC5wbmciPj08aW1nIHdpZHRoPTQyIGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwL0IwLzcyL3JCQUNFMVZpbklPeEh2T1lBQUFCendDWjZCazg4MC5wbmciPj01z4DvvIjljpjnsbPvvIk8YnI+5pWF6YCJ77yaQ++8jg==

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