一道几何图形奥数题。答对十分,我会在附加50分,急急急急急急

2024-12-26 14:48:08
推荐回答(5个)
回答1:

设对角线的一半为x,也就是半径为x。
那么半径:x×x÷2=1/4(正方形面积的1/4)
x²=1/2
扇形面积:3.14×x²×1/4=0.3925cm²
2个扇形面积为:0.3925×2=0.785cm²
正方形面积-2个扇形面积=1-0.785=0.215cm²(不在扇形内的空白面积)
阴影面积=1-0.215×2=0.57cm²

回答2:

单个阴影面积14.2699平方毫米

4个的总面积是57.0796平方毫米

我是用绘图的方法得出的结果可能和你的初衷不同,但绝对是标准答案

回答3:

先求出一个三角形的面积 再求出一个4分之1的圆的面积 拿三角形面积减去4分之1的圆的面积再除以2 然后拿得出的数乘8 最后求正方形的面积 拿正方形的面积减去8个(就是刚刚乘的8个) 就得到阴影部分的面积

三角形就是一个正方形除以2的三角形

回答4:

设半径为x。
那么半径等于x×x÷2=1/4(正方形面积的1/4)
x²=1/2
扇形面积:3.14×x²×1/4=0.3925cm²
2个扇形面积为:0.3925×2=0.785cm²
正方形面积减去2个扇形面积=1-0.785=0.215cm²(不在扇形内的空白面积)
那么阴影面积=1-0.215×2=0.57cm²

回答5:

先求出一个三角形的面积 再求出一个4分之1的圆的面积 拿三角形面积减去4分之1的圆的面积再除以2 然后拿得出的数乘8 最后求正方形的面积 拿正方形的面积减去8个(就是刚刚乘的8个) 就得到阴影部分的面积
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