Sat2数学two identical spheres of radius 6 intersect so that the distance between their centre
题目
Sat2数学two identical spheres of radius 6 intersect so that the distance between their centre
原题Two identical spheres of radius 6 intersect so that the distance between their center is 10.The points of intersection of the two spheres form a circle.What is the area of this circle?
答案
如果我英文理解没错,这就是个初中求圆面积题.
两球圆心连线上是4 2 4的分段.
求的是半径6的圆,半径上距离圆心5的点上引垂直线,与圆相交后得出的线段长,此长度正是所求圆形面积的圆形直径.
口算结果11π
举一反三
已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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