1 . 如图是一片平坦的盐滩上布满了大小相近的六边形,人们惊叹于大自然的鬼斧神工,同时也尝试解开盐滩图案之谜,人们发现正六边形能够最大限度的利用空间,已知图中的正六边形与正方形的周长都等于12,则它们的面积之差为_______ .
您最近一年使用:0次
2 . 如图1,线段
的长度一定,现将线段首尾相连,围成正
边形(
,且
为整数),已知正
边形的面积S(单位:
)与边数
(单位:条)之间的关系如图2所示.
__________
,当
时,
__________
.
(2)发现:观察图像,写出正
边形的面积
随边数
的变化趋势为__________.
(3)猜想:把线段
围成什么图形时面积最大,并求出最大面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bcfc48f9bc23cc43085bdb910e7a136.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/405554b6a34430029b4bab739d69bca3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/405554b6a34430029b4bab739d69bca3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c345907ebe27888332b1b44c666cc47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/447a9718a502491b47072ce013c26a2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88ce13774b09ff2edddaf21a072cf60a.png)
(2)发现:观察图像,写出正
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(3)猜想:把线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
您最近一年使用:0次
名校
3 . 已知正八边形的周长是
,则这个多边形的边长等于_______
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5df73433f151b6016f23788ebd995ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
您最近一年使用:0次
4 . 小亮绘制了一个如图所示的大长方形,上面绘有五个小长方形,若这五个小长方形的周长之和为50,则大长方形的周长为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/29/376fa91a-6402-4335-88f8-4a26ef437236.png?resizew=171)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/29/376fa91a-6402-4335-88f8-4a26ef437236.png?resizew=171)
A.25 | B.50 | C.75 | D.100 |
您最近一年使用:0次
5 . 如图,在正八边形中,连接
,设
,四边形
的周长分别为
,则下列正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/23/66380035-13c1-4c6d-bce3-9a953d03f8b8.png?resizew=139)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbcf3b554977189d23fdea7f4d1cdb9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b312dab930cbbb9a4bb1a99f044dab73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/23/66380035-13c1-4c6d-bce3-9a953d03f8b8.png?resizew=139)
A.![]() | B.![]() |
C.![]() | D.无法比较![]() |
您最近一年使用:0次
2023-12-26更新
|
119次组卷
|
2卷引用:河北省沧州市献县献县第五中学、现代中学2023-2024学年八年级上学期月考数学试题
6 . 1.如图在平面直角坐标系中,
、
两点坐标分别为
,
.
(1)若点
是
轴上一个动点,当
的周长最短时,最短周长是______ .
(2)设
、
分别为
轴和
轴上的动点,存在这样的点
、
,使四边形
的周长最短,最短周长是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51116e96f4c35d90677e91e0aa914111.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb28194b2e3fde6d395a61e677bc7161.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/23/8ebae0f6-2dab-4d9e-89c2-42f6b942b871.png?resizew=214)
(1)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a02b1139e07e431b5d4276757b232bad.png)
您最近一年使用:0次
2023-11-23更新
|
220次组卷
|
2卷引用:安徽省宿州市萧县2023-2024学年八年级上学期期中数学试题
7 . 三角形边长分别为6和5,第三边是方程
的解,则此三角形的周长是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca0a5f96778e7c10c34870076e9c5c49.png)
A.15 | B.13 | C.15或13 | D.15或17 |
您最近一年使用:0次
2023-10-10更新
|
263次组卷
|
2卷引用:广东省佛山市顺德区2023-2024学年九年级上学期第一次月考数学试题
8 . 如图,将周长为
的
沿
方向平移
个单位长度得到
,则四边形
的周长为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3304e23f3b0f9569c4140ca89b6498.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03b1e48b189ed48dc8cd4edc0ae7bc00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85719346f464a101d365d42be27450a3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/9/50d8be0a-f30e-4499-8927-ceb0e84bf4a9.jpg?resizew=159)
您最近一年使用:0次
名校
9 . 如图,螺母的一个面的外沿可以看作是正六边形,这个正六边形
的半径是
,则这个正六边形的周长是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/976260cbf5e30856d4fd37a4b0a671a7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/2/0621ae11-917e-47c9-ab78-17ee4c9424da.png?resizew=155)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次