(本题满分10分)如图,在平面直角坐标系中,O为原点,每个小方格

(本题满分10分)如图,在平面直角坐标系中,O为原点,每个小方格的边长为1个单位长度.在第一象限内有横、纵坐标均为整数的AB两点,且OA= OB=

(1)写出AB两点的坐标;

(2)画出线段AB绕点O旋转一周所形成的图形,并求其面积(结果保留π).

 

答案

 

(1)A、B或A、B

(2)

解析:

解:(1)A、B两点坐标分别为A、B

或A、B……………4分

(2)画图(如图),       ……7分

由题意得:大圆半径,

小圆半径

………10分

 

相关题目

I like music very much, pop songs particularly. Every evening then I am doing h
I like music very much, pop songs particularly. Every evening then I am doing homework and at weekends when I at home, I always play some of my favorite songs on my tape recorder. The familiar patt
(4分)你从一个受精卵发育成长为一个小帅哥、小美女,让
(4分)你从一个受精卵发育成长为一个小帅哥、小美女,让我们看到了生命的奇妙变化。下图所示为人体组织形成过程。请分析回答问题:(1)图中①
A~J为中学化学中常见的几种物质。它们有如图转化关系:
A~J为中学化学中常见的几种物质。它们有如图转化关系: 常温下,A为生活中常见的无色无味液体,F、I为气体单质,B、D为常见金属,I分子中电子总
Every destination has its to-do list----go to Pairs and not climb the tower? No,
Every destination has its to-do list----go to Pairs and not climb the tower? No, And if you take a trip to Tasmania, give yourself two weeks and you can pretty much do all the must-sees in the island
—Next week I will go to a job interview. Will you give me some suggestions?
—Next week I will go to a job interview. Will you give me some suggestions?        —Smiling is a great way to make yourself ________. A.stand out  B.turn out    C.work out  D
在一长直导线中通以如图所示的恒定电流时,套在长直导线
在一长直导线中通以如图所示的恒定电流时,套在长直导线上的闭合线环(环面与导线垂直,长直导线通过环的中心),当发生以下变化时,肯定能产
 We welcome good employees, ______ their age or sex.              A.
 We welcome good employees, ______ their age or sex.              A. thanks to    B regardless of    C. because of    D. due to

最新题目